{"id":2012,"date":"2017-02-21T17:41:24","date_gmt":"2017-02-21T23:41:24","guid":{"rendered":"http:\/\/www.logikalsolutions.com\/wordpress\/?p=2012"},"modified":"2023-12-08T16:08:36","modified_gmt":"2023-12-08T22:08:36","slug":"roman-numeral-calculator","status":"publish","type":"post","link":"https:\/\/www.logikalsolutions.com\/wordpress\/information-technology\/roman-numeral-calculator\/","title":{"rendered":"Roman Numeral Calculator"},"content":{"rendered":"\n

If you work long enough in IT you will start to really get tired of all the cutesy ways companies try to “select” developers\/consultants. Some of the worst ones send people to take on-line tests from commercial sites at the candidates own expense. I don’t see that much on reqs anymore. Why? Because only the most desperate of bottom feeders would do it. In truth the candidates were a good match because only a bottom feeding company would ask a programmer to take an on-line test if they had other developers using the same language.<\/p>\n\n\n\n

A trend I’m seeing a lot of now is the “spend a day with us” thing. They usually have you spend a couple of hours coding a solution to one of the on-line problems. One of the most often used is the Roman Number Calculator<\/a>. There are many of these on-line. Since today was a frustrating day and I get tired of seeing that, here is the code for one using Qt which was hacked out in roughly the 2 hour time. Hard to tell how long because I had multiple pimps calling me trying to tell me illegal alien wages really were market rate.<\/p>\n\n\n\n

The Code<\/h2>\n\n\n\n

I didn’t put much in the way of comments nor did I get really fancy. I actually chose to code it because I hadn’t done a console app in a long time.<\/p>\n\n\n\n

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#include<\/span> <\/span><<\/span>QCoreApplication<\/span>><\/span><\/span>\n#include<\/span> <\/span><<\/span>QDebug<\/span>><\/span><\/span>\n#include<\/span> <\/span><<\/span>QTimer<\/span>><\/span><\/span>\n<\/span>\n#include<\/span> <\/span>"<\/span>consoleinput.h<\/span>"<\/span><\/span>\n<\/span>\nint<\/span> <\/span>main<\/span>(<\/span>int<\/span> <\/span>argc<\/span>,<\/span> <\/span>char<\/span> <\/span>*<\/span>argv<\/span>[])<\/span><\/span>\n{<\/span><\/span>\n\u00a0\u00a0\u00a0 QCoreApplication <\/span>a<\/span>(<\/span>argc<\/span>,<\/span> argv<\/span>);<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0 ConsoleInput console<\/span>;<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0 <\/span>bool<\/span> b <\/span>=<\/span> a<\/span>.<\/span>connect<\/span>(&<\/span>console<\/span>,<\/span> <\/span>&<\/span>ConsoleInput<\/span>::<\/span>quit<\/span>,<\/span> <\/span>&<\/span>a<\/span>,<\/span> <\/span>&<\/span>QCoreApplication<\/span>::<\/span>quit<\/span>);<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>qDebug<\/span>()<\/span> <\/span><<<\/span> <\/span>"<\/span>result of connect <\/span>"<\/span> <\/span><<<\/span> b<\/span>;<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0 <\/span>QTimer<\/span>::<\/span>singleShot<\/span>(<\/span>0<\/span>,<\/span> <\/span>&<\/span>console<\/span>,<\/span> <\/span>&<\/span>ConsoleInput<\/span>::<\/span>run<\/span>);<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0 <\/span>return<\/span> a<\/span>.<\/span>exec<\/span>();<\/span><\/span>\n}<\/span><\/span>\n<\/span>\n<\/span><\/code><\/pre><\/div>\n\n\n\n
What is interesting in our main.cpp is the QTimer line. You cannot cleanly exit unless you are running inside of the event loop. It is one we all forget and can cost us lots of hours.<\/p>\n\n\n\n
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\/\/ consoleinput.h<\/span><\/span>\n#ifndef<\/span> <\/span>CONSOLEINPUT_H<\/span><\/span>\n#define<\/span> <\/span>CONSOLEINPUT_H<\/span><\/span>\n<\/span>\n#include<\/span> <\/span><<\/span>QObject<\/span>><\/span><\/span>\n<\/span>\nclass<\/span> <\/span>ConsoleInput<\/span> <\/span>:<\/span> <\/span>public<\/span> <\/span>QObject<\/span><\/span>\n{<\/span><\/span>\n\u00a0\u00a0\u00a0 Q_OBJECT<\/span><\/span>\npublic<\/span>:<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>explicit<\/span> <\/span>ConsoleInput<\/span>(<\/span>QObject<\/span> <\/span>*<\/span>parent<\/span> <\/span>=<\/span> <\/span>0<\/span>);<\/span><\/span>\n<\/span>\nsignals:<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>void<\/span> <\/span>quit<\/span>();<\/span><\/span>\n<\/span>\npublic slots:<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>void<\/span> <\/span>run<\/span>();<\/span><\/span>\n};<\/span><\/span>\n<\/span>\n#endif<\/span> \/\/ CONSOLEINPUT_H<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
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\/\/ consoleinput.cpp<\/span><\/span>\n<\/span>\n#include<\/span> <\/span>"<\/span>consoleinput.h<\/span>"<\/span><\/span>\n#include<\/span> <\/span>"<\/span>parseromannumbertext.h<\/span>"<\/span><\/span>\n#include<\/span> <\/span><<\/span>QDebug<\/span>><\/span><\/span>\n#include<\/span> <\/span><<\/span>QTextStream<\/span>><\/span><\/span>\n#include<\/span> <\/span><<\/span>QFile<\/span>><\/span><\/span>\n#include<\/span> <\/span><<\/span>QStringList<\/span>><\/span><\/span>\n#include<\/span> <\/span><<\/span>iostream<\/span>><\/span><\/span>\n<\/span>\nConsoleInput<\/span>::<\/span>ConsoleInput<\/span>(<\/span>QObject <\/span>*<\/span>parent<\/span>)<\/span> : <\/span>QObject<\/span>(<\/span>parent<\/span>)<\/span><\/span>\n{<\/span><\/span>\n<\/span>\n}<\/span><\/span>\n<\/span>\n<\/span>\nvoid<\/span> <\/span>ConsoleInput<\/span>::<\/span>run<\/span>()<\/span><\/span>\n{<\/span><\/span>\n\u00a0\u00a0\u00a0 ParseRomanNumberText p<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>qDebug<\/span>()<\/span> <\/span><<<\/span> <\/span>"<\/span> 24 : <\/span>"<\/span> <\/span><<<\/span> p<\/span>.<\/span>toString<\/span>(<\/span>24<\/span>);<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>qDebug<\/span>()<\/span> <\/span><<<\/span> <\/span>"<\/span> 39 : <\/span>"<\/span> <\/span><<<\/span> p<\/span>.<\/span>toString<\/span>(<\/span>39<\/span>);<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>qDebug<\/span>()<\/span> <\/span><<<\/span> <\/span>"<\/span> 49 : <\/span>"<\/span> <\/span><<<\/span> p<\/span>.<\/span>toString<\/span>(<\/span>49<\/span>);<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>qDebug<\/span>()<\/span> <\/span><<<\/span> <\/span>"<\/span> 449 : <\/span>"<\/span> <\/span><<<\/span> p<\/span>.<\/span>toString<\/span>(<\/span>449<\/span>);<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>qDebug<\/span>()<\/span> <\/span><<<\/span> <\/span>"<\/span> 999 : <\/span>"<\/span> <\/span><<<\/span> p<\/span>.<\/span>toString<\/span>(<\/span>999<\/span>);<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0 <\/span>qDebug<\/span>()<\/span> <\/span><<<\/span> <\/span>"<\/span> toInt() tests <\/span>"<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>qDebug<\/span>()<\/span> <\/span><<<\/span> <\/span>"<\/span>\u00a0 XXIV : <\/span>"<\/span> <\/span><<<\/span> p<\/span>.<\/span>toInt<\/span>(<\/span>"<\/span>XXIV<\/span>"<\/span>);<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>qDebug<\/span>()<\/span> <\/span><<<\/span> <\/span>"<\/span>\u00a0 XXXIX : <\/span>"<\/span> <\/span><<<\/span> p<\/span>.<\/span>toInt<\/span>(<\/span>"<\/span>XXXIX<\/span>"<\/span>);<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>qDebug<\/span>()<\/span> <\/span><<<\/span> <\/span>"<\/span>\u00a0 XLIX : <\/span>"<\/span> <\/span><<<\/span> p<\/span>.<\/span>toInt<\/span>(<\/span>"<\/span>XLIX<\/span>"<\/span>);<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>qDebug<\/span>()<\/span> <\/span><<<\/span> <\/span>"<\/span>\u00a0 CDXLIX : <\/span>"<\/span> <\/span><<<\/span> p<\/span>.<\/span>toInt<\/span>(<\/span>"<\/span>CDXLIX<\/span>"<\/span>);<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>qDebug<\/span>()<\/span> <\/span><<<\/span> <\/span>"<\/span>\u00a0 CMXCIX : <\/span>"<\/span> <\/span><<<\/span> p<\/span>.<\/span>toInt<\/span>(<\/span>"<\/span>CMXCIX<\/span>"<\/span>);<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0 <\/span>qDebug<\/span>()<\/span> <\/span><<<\/span> <\/span>"<\/span>\u00a0 CC13 : <\/span>"<\/span> <\/span><<<\/span> p<\/span>.<\/span>toInt<\/span>(<\/span>"<\/span>CC13<\/span>"<\/span>);<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0 <\/span>bool<\/span> endOfJob <\/span>=<\/span> <\/span>false;<\/span><\/span>\n\u00a0\u00a0\u00a0 QTextStream <\/span>in<\/span>(<\/span>stdin<\/span>);<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>qDebug<\/span>()<\/span> <\/span><<<\/span> <\/span>"<\/span>type exit to quit<\/span>"<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>while<\/span> <\/span>(!<\/span>in<\/span>.<\/span>atEnd<\/span>()<\/span>\u00a0 <\/span>&&<\/span>\u00a0 <\/span>!<\/span>endOfJob<\/span>)<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>{<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 QString line <\/span>=<\/span> <\/span>in<\/span>.<\/span>readLine<\/span>();<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 line <\/span>=<\/span> <\/span>line<\/span>.<\/span>toUpper<\/span>();<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>if<\/span> <\/span>(<\/span>line<\/span>.<\/span>compare<\/span>(<\/span>"<\/span>EXIT<\/span>"<\/span>,<\/span> <\/span>Qt<\/span>::<\/span>CaseInsensitive<\/span>)<\/span> <\/span>==<\/span> <\/span>0<\/span>)<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>{<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 endOfJob <\/span>=<\/span> <\/span>true;<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>continue<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>}<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>else<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>{<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 QStringList lst<\/span>;<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>if<\/span> <\/span>(<\/span>line<\/span>.<\/span>indexOf<\/span>(<\/span>'<\/span>+<\/span>'<\/span>)<\/span> <\/span>><\/span> <\/span>-<\/span>1<\/span>)<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>{<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 lst <\/span><<<\/span> <\/span>line<\/span>.<\/span>left<\/span>(<\/span>line<\/span>.<\/span>indexOf<\/span>(<\/span>'<\/span>+<\/span>'<\/span>))<\/span> <\/span><<<\/span> <\/span>"<\/span>+<\/span>"<\/span> <\/span><<<\/span> <\/span>line<\/span>.<\/span>right<\/span>(<\/span>line<\/span>.<\/span>indexOf<\/span>(<\/span>'<\/span>+<\/span>'<\/span>)-<\/span>1<\/span>);<\/span>\u00a0 \/\/ + has special meaning to input stream<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>}<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>else<\/span> <\/span>if<\/span> <\/span>(<\/span>line<\/span>.<\/span>indexOf<\/span>(<\/span>'<\/span>-<\/span>'<\/span>)<\/span> <\/span>><\/span> <\/span>-<\/span>1<\/span>)<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>{<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 lst <\/span><<<\/span> <\/span>line<\/span>.<\/span>left<\/span>(<\/span>line<\/span>.<\/span>indexOf<\/span>(<\/span>'<\/span>-<\/span>'<\/span>))<\/span> <\/span><<<\/span> <\/span>"<\/span>-<\/span>"<\/span> <\/span><<<\/span> <\/span>line<\/span>.<\/span>right<\/span>(<\/span>line<\/span>.<\/span>indexOf<\/span>(<\/span>'<\/span>-<\/span>'<\/span>));<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>}<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>else<\/span> <\/span>if<\/span> <\/span>(<\/span>line<\/span>.<\/span>indexOf<\/span>(<\/span>'<\/span>*<\/span>'<\/span>)<\/span> <\/span>><\/span> <\/span>-<\/span>1<\/span> <\/span>)<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>{<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 lst <\/span><<<\/span> <\/span>line<\/span>.<\/span>left<\/span>(<\/span>line<\/span>.<\/span>indexOf<\/span>(<\/span>'<\/span>*<\/span>'<\/span>))<\/span> <\/span><<<\/span> <\/span>"<\/span>*<\/span>"<\/span> <\/span><<<\/span> <\/span>line<\/span>.<\/span>right<\/span>(<\/span>line<\/span>.<\/span>indexOf<\/span>(<\/span>'<\/span>*<\/span>'<\/span>)-<\/span>1<\/span>);<\/span>\u00a0 \/\/ * has special meaning to input stream<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>}<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>else<\/span> <\/span>if<\/span> <\/span>(<\/span>line<\/span>.<\/span>indexOf<\/span>(<\/span>'<\/span>\/<\/span>'<\/span>)<\/span> <\/span>><\/span> <\/span>-<\/span>1<\/span>)<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>{<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 lst <\/span><<<\/span> <\/span>line<\/span>.<\/span>left<\/span>(<\/span>line<\/span>.<\/span>indexOf<\/span>(<\/span>'<\/span>\/<\/span>'<\/span>))<\/span> <\/span><<<\/span> <\/span>"<\/span>\/<\/span>"<\/span> <\/span><<<\/span> <\/span>line<\/span>.<\/span>right<\/span>(<\/span>line<\/span>.<\/span>indexOf<\/span>(<\/span>'<\/span>\/<\/span>'<\/span>));<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>}<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>if<\/span> <\/span>(<\/span>lst<\/span>.<\/span>size<\/span>()<\/span> <\/span>><\/span> <\/span>0<\/span>)<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>{<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>if<\/span> <\/span>(<\/span>p<\/span>.<\/span>isValidRomanNumber<\/span>(<\/span>lst<\/span>[<\/span>0<\/span>])<\/span> <\/span>&&<\/span> <\/span>p<\/span>.<\/span>isValidRomanNumber<\/span>(<\/span>lst<\/span>[<\/span>2<\/span>]))<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>{<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>int<\/span> x <\/span>=<\/span> <\/span>p<\/span>.<\/span>toInt<\/span>(<\/span> <\/span>lst<\/span>[<\/span>0<\/span>]);<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>int<\/span> y <\/span>=<\/span> <\/span>p<\/span>.<\/span>toInt<\/span>(<\/span>lst<\/span>[<\/span>2<\/span>]);<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>int<\/span> result<\/span>=<\/span>0<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>if<\/span> <\/span>(<\/span>lst<\/span>[<\/span>1<\/span>].<\/span>compare<\/span>(<\/span>"<\/span>+<\/span>"<\/span>)<\/span> <\/span>==<\/span> <\/span>0<\/span>)<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>{<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 result <\/span>=<\/span> x <\/span>+<\/span> y<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>}<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>else<\/span> <\/span>if<\/span> <\/span>(<\/span>lst<\/span>[<\/span>1<\/span>].<\/span>compare<\/span>(<\/span>"<\/span>-<\/span>"<\/span>)<\/span> <\/span>==<\/span> <\/span>0<\/span>)<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>{<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 result <\/span>=<\/span> x <\/span>-<\/span> y<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>}<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>else<\/span> <\/span>if<\/span> <\/span>(<\/span>lst<\/span>[<\/span>1<\/span>].<\/span>compare<\/span>(<\/span>"<\/span>*<\/span>"<\/span>)<\/span> <\/span>==<\/span> <\/span>0<\/span>)<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>{<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 result <\/span>=<\/span> x <\/span>*<\/span> y<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>}<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>else<\/span> <\/span>if<\/span> <\/span>(<\/span>lst<\/span>[<\/span>1<\/span>].<\/span>compare<\/span>(<\/span>"<\/span>\/<\/span>"<\/span>)<\/span> <\/span>==<\/span> <\/span>0<\/span>)<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>{<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 result <\/span>=<\/span> x <\/span>\/<\/span> y<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>}<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>qDebug<\/span>()<\/span> <\/span><<<\/span> line <\/span><<<\/span> <\/span>"<\/span> = <\/span>"<\/span> <\/span><<<\/span> <\/span>p<\/span>.<\/span>toString<\/span>(<\/span>result<\/span>);<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>}<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>else<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>{<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>qDebug<\/span>()<\/span> <\/span><<<\/span> <\/span>"<\/span>both values must be valid roman numbers<\/span>"<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>}<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>}<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>}<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>}<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0 emit <\/span>quit<\/span>();<\/span><\/span>\n}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
The only lines of note here are the parsing of + and * operations. Those appear to be special characters for this particular input method as they get doubled in the actual stream. Yes, I should know why and I used to but, I’m certain some little geek will chime in. All you really have to know is there be dragons<\/em> and move on. Why there are dragons doesn’t really matter, just know the names of the dragons and avoid them.<\/p>\n\n\n\n
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\/\/ parseromannumbertext.h<\/span><\/span>\n<\/span>\n#ifndef<\/span> <\/span>PARSEROMANNUMBERTEXT_H<\/span><\/span>\n#define<\/span> <\/span>PARSEROMANNUMBERTEXT_H<\/span><\/span>\n<\/span>\n#include<\/span> <\/span><<\/span>QObject<\/span>><\/span><\/span>\n#include<\/span> <\/span><<\/span>QMap<\/span>><\/span><\/span>\n<\/span>\nclass<\/span> <\/span>ParseRomanNumberText<\/span> <\/span>:<\/span> <\/span>public<\/span> <\/span>QObject<\/span><\/span>\n{<\/span><\/span>\n\u00a0\u00a0\u00a0 Q_OBJECT<\/span><\/span>\npublic<\/span>:<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>explicit<\/span> <\/span>ParseRomanNumberText<\/span>(<\/span>QObject<\/span> <\/span>*<\/span>parent<\/span> <\/span>=<\/span> <\/span>0<\/span>);<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0 <\/span>int<\/span> <\/span>toInt<\/span>(<\/span> <\/span>QString<\/span> <\/span>romanNumberText<\/span>);<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>QString<\/span> <\/span>toString<\/span>(<\/span> <\/span>int<\/span> <\/span>value<\/span>);<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>bool<\/span> <\/span>isValidRomanNumber<\/span>(<\/span>QString<\/span> <\/span>romanNumberText<\/span>);<\/span><\/span>\n<\/span>\n<\/span>\nsignals:<\/span><\/span>\n<\/span>\npublic slots:<\/span><\/span>\nprivate<\/span>:<\/span><\/span>\n\u00a0\u00a0\u00a0 QMap<\/span><<\/span>QChar<\/span>,<\/span> <\/span>int<\/span>><\/span> m_letterMap<\/span>;<\/span><\/span>\n};<\/span><\/span>\n<\/span>\n#endif<\/span> \/\/ PARSEROMANNUMBERTEXT_H<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
The closest I came to cute here was using a QMap to translate roman numbers to numeric values.<\/p>\n\n\n\n
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\/\/ parseromannumbertext.cpp<\/span><\/span>\n<\/span>\n#include<\/span> <\/span>"<\/span>parseromannumbertext.h<\/span>"<\/span><\/span>\n#include<\/span> <\/span><<\/span>QRegularExpression<\/span>><\/span><\/span>\n#include<\/span> <\/span><<\/span>QRegularExpressionMatch<\/span>><\/span><\/span>\n#include<\/span> <\/span><<\/span>QDebug<\/span>><\/span><\/span>\n#include<\/span> <\/span><<\/span>QByteArray<\/span>><\/span><\/span>\n<\/span>\nParseRomanNumberText<\/span>::<\/span>ParseRomanNumberText<\/span>(<\/span>QObject <\/span>*<\/span>parent<\/span>)<\/span> : <\/span>QObject<\/span>(<\/span>parent<\/span>)<\/span><\/span>\n{<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>m_letterMap<\/span>[<\/span>'<\/span>I<\/span>'<\/span>]<\/span>\u00a0\u00a0\u00a0 <\/span>=<\/span> <\/span>1<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>m_letterMap<\/span>[<\/span>'<\/span>V<\/span>'<\/span>]<\/span>\u00a0\u00a0\u00a0 <\/span>=<\/span> <\/span>5<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>m_letterMap<\/span>[<\/span>'<\/span>X<\/span>'<\/span>]<\/span>\u00a0\u00a0\u00a0 <\/span>=<\/span> <\/span>10<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>m_letterMap<\/span>[<\/span>'<\/span>L<\/span>'<\/span>]<\/span>\u00a0\u00a0\u00a0 <\/span>=<\/span> <\/span>50<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>m_letterMap<\/span>[<\/span>'<\/span>C<\/span>'<\/span>]<\/span>\u00a0\u00a0\u00a0 <\/span>=<\/span> <\/span>100<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>m_letterMap<\/span>[<\/span>'<\/span>D<\/span>'<\/span>]<\/span>\u00a0\u00a0\u00a0 <\/span>=<\/span> <\/span>500<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>m_letterMap<\/span>[<\/span>'<\/span>M<\/span>'<\/span>]<\/span>\u00a0\u00a0\u00a0 <\/span>=<\/span> <\/span>1000<\/span>;<\/span><\/span>\n}<\/span><\/span>\n<\/span>\nint<\/span> <\/span>ParseRomanNumberText<\/span>::<\/span>toInt<\/span>(<\/span>QString<\/span> <\/span>romanNumberText<\/span>)<\/span><\/span>\n{<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>int<\/span> retVal <\/span>=<\/span> <\/span>0<\/span>;<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0 QString workStr <\/span>=<\/span> romanNumberText<\/span>.<\/span>toUpper<\/span>();<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>if<\/span> <\/span>(<\/span>isValidRomanNumber<\/span>(<\/span>workStr<\/span>))<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>{<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ Roman numbers must be in ever decreasing value.<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ If the digit following the current digit is higher in value<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ then it is subtracted from the next digit.<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 QByteArray letters <\/span>=<\/span> <\/span>workStr<\/span>.<\/span>toLatin1<\/span>();<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>int<\/span> x<\/span>=<\/span>0<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>while<\/span>(<\/span> x <\/span><<\/span> <\/span>letters<\/span>.<\/span>size<\/span>())<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>{<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>bool<\/span> isSpecial <\/span>=<\/span> <\/span>false;<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>int<\/span> y <\/span>=<\/span> x<\/span>+<\/span>1<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>if<\/span> <\/span>(<\/span>y <\/span><<\/span> <\/span>letters<\/span>.<\/span>size<\/span>())<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>{<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>if<\/span> <\/span>(<\/span>m_letterMap<\/span>[<\/span> <\/span>QChar<\/span>(<\/span>letters<\/span>[<\/span>x<\/span>])]<\/span> <\/span><<\/span> <\/span>m_letterMap<\/span>[<\/span> <\/span>QChar<\/span>(<\/span>letters<\/span>[<\/span>y<\/span>])])<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>{<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ Handle case of 9 and 4 here<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 isSpecial <\/span>=<\/span> <\/span>true;<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 retVal <\/span>+=<\/span> <\/span>(<\/span> <\/span>m_letterMap<\/span>[<\/span> <\/span>QChar<\/span>(<\/span>letters<\/span>[<\/span>y<\/span>])]<\/span> <\/span>-<\/span> <\/span>m_letterMap<\/span>[<\/span> <\/span>QChar<\/span>(<\/span>letters<\/span>[<\/span>x<\/span>])]);<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>++<\/span>x<\/span>;<\/span>\u00a0 \/\/ consume second letter<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>}<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>}<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>if<\/span> <\/span>(!<\/span>isSpecial<\/span>)<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>{<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 retVal <\/span>+=<\/span> <\/span>m_letterMap<\/span>[<\/span> <\/span>QChar<\/span>(<\/span>letters<\/span>[<\/span>x<\/span>])];<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>}<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>++<\/span>x<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>}<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0 <\/span>}<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>else<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>{<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>qDebug<\/span>()<\/span> <\/span><<<\/span> <\/span>"<\/span> Number: <\/span>"<\/span> <\/span><<<\/span> romanNumberText <\/span><<<\/span> <\/span>"<\/span> is not valid<\/span>"<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>}<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>return<\/span> retVal<\/span>;<\/span><\/span>\n}<\/span><\/span>\n<\/span>\nQString<\/span> <\/span>ParseRomanNumberText<\/span>::<\/span>toString<\/span>(<\/span>int<\/span> <\/span>value<\/span>)<\/span><\/span>\n{<\/span><\/span>\n\u00a0\u00a0\u00a0 QString retVal <\/span>=<\/span> <\/span>"<\/span>invalid number<\/span>"<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>if<\/span> <\/span>(<\/span>value <\/span>><\/span> <\/span>4000<\/span>)<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>{<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>return<\/span> retVal<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>}<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0 <\/span>int<\/span> workValue <\/span>=<\/span> value<\/span>;<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0 <\/span>int<\/span> mCount <\/span>=<\/span> workValue <\/span>\/<\/span> m_letterMap<\/span>[<\/span>'<\/span>M<\/span>'<\/span>];<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0 workValue <\/span>-=<\/span> <\/span>(<\/span>mCount <\/span>*<\/span> m_letterMap<\/span>[<\/span>'<\/span>M<\/span>'<\/span>]);<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0 <\/span>int<\/span> cCount <\/span>=<\/span> workValue <\/span>\/<\/span> m_letterMap<\/span>[<\/span>'<\/span>C<\/span>'<\/span>];<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0 workValue <\/span>-=<\/span> <\/span>(<\/span>cCount <\/span>*<\/span> m_letterMap<\/span>[<\/span>'<\/span>C<\/span>'<\/span>]);<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0 <\/span>int<\/span> xCount <\/span>=<\/span> workValue <\/span>\/<\/span> m_letterMap<\/span>[<\/span>'<\/span>X<\/span>'<\/span>];<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0 workValue <\/span>-=<\/span> <\/span>(<\/span>xCount <\/span>*<\/span> m_letterMap<\/span>[<\/span>'<\/span>X<\/span>'<\/span>]);<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0 <\/span>int<\/span> iCount <\/span>=<\/span> workValue<\/span>;<\/span><\/span>\n<\/span>\n<\/span>\n\u00a0\u00a0\u00a0 QString <\/span>mString<\/span>(<\/span> mCount<\/span>,<\/span> <\/span>'<\/span>M<\/span>'<\/span>);<\/span><\/span>\n<\/span>\n<\/span>\n\u00a0\u00a0\u00a0 QString cString<\/span>;<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0 <\/span>switch<\/span>(<\/span>cCount<\/span>)<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>{<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>case<\/span> <\/span>4<\/span>:<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 cString <\/span>=<\/span> <\/span>"<\/span>CD<\/span>"<\/span>;<\/span>\u00a0 \/\/ 400<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>break<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>case<\/span> <\/span>5<\/span>:<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 cString <\/span>=<\/span> <\/span>"<\/span>D<\/span>"<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>break<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>case<\/span> <\/span>6<\/span>:<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 cString <\/span>=<\/span> <\/span>"<\/span>DC<\/span>"<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>case<\/span> <\/span>7<\/span>:<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 cString <\/span>=<\/span> <\/span>"<\/span>DCC<\/span>"<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>break<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>case<\/span> <\/span>8<\/span>:<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 cString <\/span>=<\/span> <\/span>"<\/span>DCCC<\/span>"<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>break<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>case<\/span> <\/span>9<\/span>:<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 cString <\/span>=<\/span> <\/span>"<\/span>CM<\/span>"<\/span>;<\/span> \/\/ 900<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>break<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>default<\/span>:<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 cString <\/span>=<\/span> <\/span>QString<\/span>(<\/span>cCount<\/span>,<\/span> <\/span>'<\/span>C<\/span>'<\/span>);<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>break<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>}<\/span><\/span>\n<\/span>\n<\/span>\n<\/span>\n\u00a0\u00a0\u00a0 QString xString<\/span>;<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0 <\/span>switch<\/span>(<\/span>xCount<\/span>)<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>{<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>case<\/span> <\/span>4<\/span>:<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 xString <\/span>=<\/span> <\/span>"<\/span>XL<\/span>"<\/span>;<\/span>\u00a0\u00a0\u00a0\u00a0 \/\/ 40<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>break<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>case<\/span> <\/span>5<\/span>:<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 xString <\/span>=<\/span> <\/span>"<\/span>L<\/span>"<\/span>;<\/span>\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ 50<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>case<\/span> <\/span>6<\/span>:<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 xString <\/span>=<\/span> <\/span>"<\/span>LX<\/span>"<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>break<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>case<\/span> <\/span>7<\/span>:<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 xString <\/span>=<\/span> <\/span>"<\/span>LXX<\/span>"<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>break<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>case<\/span> <\/span>8<\/span>:<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 xString <\/span>=<\/span> <\/span>"<\/span>LXXX<\/span>"<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>break<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>case<\/span> <\/span>9<\/span>:<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 xString <\/span>=<\/span> <\/span>"<\/span>XC<\/span>"<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>break<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>default<\/span>:<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 xString <\/span>=<\/span> <\/span>QString<\/span>(<\/span>xCount<\/span>,<\/span> <\/span>'<\/span>X<\/span>'<\/span>);<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>break<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>}<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0 QString iString<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>switch<\/span>(<\/span>iCount<\/span>)<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>{<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>case<\/span> <\/span>4<\/span>:<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 iString <\/span>=<\/span> <\/span>"<\/span>IV<\/span>"<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>break<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>case<\/span> <\/span>5<\/span>:<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 iString <\/span>=<\/span> <\/span>"<\/span>V<\/span>"<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>break<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>case<\/span> <\/span>6<\/span>:<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 iString <\/span>=<\/span> <\/span>"<\/span>VI<\/span>"<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>break<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>case<\/span> <\/span>7<\/span>:<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 iString <\/span>=<\/span> <\/span>"<\/span>VII<\/span>"<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>break<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>case<\/span> <\/span>8<\/span>:<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 iString <\/span>=<\/span> <\/span>"<\/span>VII<\/span>"<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>break<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>case<\/span> <\/span>9<\/span>:<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 iString <\/span>=<\/span> <\/span>"<\/span>IX<\/span>"<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>break<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>default<\/span>:<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 iString <\/span>=<\/span> <\/span>QString<\/span>(<\/span>iCount<\/span>,<\/span> <\/span>'<\/span>I<\/span>'<\/span>);<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>break<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>}<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0 retVal <\/span>=<\/span> <\/span>""<\/span>;<\/span><\/span>\n\u00a0\u00a0\u00a0 QTextStream <\/span>stream<\/span>(&<\/span>retVal<\/span>);<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0 stream <\/span><<<\/span> mString <\/span><<<\/span> cString <\/span><<<\/span> xString <\/span><<<\/span> iString<\/span>;<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0 <\/span>return<\/span> retVal<\/span>;<\/span><\/span>\n<\/span>\n}<\/span><\/span>\n<\/span>\nbool<\/span> <\/span>ParseRomanNumberText<\/span>::<\/span>isValidRomanNumber<\/span>(<\/span>QString<\/span> <\/span>romanNumberText<\/span>)<\/span><\/span>\n{<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>bool<\/span> retVal <\/span>=<\/span> <\/span>false;<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0 QString workStr <\/span>=<\/span> romanNumberText<\/span>;<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0 workStr<\/span>.<\/span>remove<\/span>(<\/span>'<\/span>M<\/span>'<\/span>);<\/span><\/span>\n\u00a0\u00a0\u00a0 workStr<\/span>.<\/span>remove<\/span>(<\/span>'<\/span>D<\/span>'<\/span>);<\/span><\/span>\n\u00a0\u00a0\u00a0 workStr<\/span>.<\/span>remove<\/span>(<\/span>'<\/span>C<\/span>'<\/span>);<\/span><\/span>\n\u00a0\u00a0\u00a0 workStr<\/span>.<\/span>remove<\/span>(<\/span>'<\/span>L<\/span>'<\/span>);<\/span><\/span>\n\u00a0\u00a0\u00a0 workStr<\/span>.<\/span>remove<\/span>(<\/span>'<\/span>X<\/span>'<\/span>);<\/span><\/span>\n\u00a0\u00a0\u00a0 workStr<\/span>.<\/span>remove<\/span>(<\/span>'<\/span>V<\/span>'<\/span>);<\/span><\/span>\n\u00a0\u00a0\u00a0 workStr<\/span>.<\/span>remove<\/span>(<\/span>'<\/span>I<\/span>'<\/span>);<\/span><\/span>\n<\/span>\n\u00a0\u00a0\u00a0 <\/span>if<\/span> <\/span>(<\/span>workStr<\/span>.<\/span>length<\/span>()<\/span> <\/span><<\/span> <\/span>1<\/span>)<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>{<\/span><\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 retVal <\/span>=<\/span> <\/span>true;<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>}<\/span><\/span>\n\u00a0\u00a0\u00a0 <\/span>return<\/span> retVal<\/span>;<\/span><\/span>\n}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
I burned a lot of time yicking around with regular expressions for the isValidRomanNumber() routine. I really hate regular expressions and mostly wish they would be banned from the programming world. Few more cryptic and undocumented strings ever get created in any program. This is especially true for the 12 year old boys trapped in older bodies who claim<\/p>\n\n\n\n
\n
If the code is properly written it does not need documentation.<\/p>\n<\/blockquote>\n\n\n\n
If you ever utter that you are a loser who should not be allowed anywhere near a keyboard. You write worthless throw away code which will never<\/em> be maintainable. Anyone who utters that phrase does not have production code which has been in place for 10+ years through business changes. I have code which has been in place for multiple decades at client sites and it has went through multiple sets of sweeping changes due to new input sources combined with business rules changes. It has a ton of comments in it and I still talk with the people who maintain it. If you follow the above philosophy programmers around the world will universally curse your name and pray to various deities that you were born sterile.<\/p>\n\n\n\n
The QMap doesn’t serve much purpose in the toString() method but it sure does in toInt(). Yes, I could have been cuter and not had the switches, but this is something which is supposed to be done within a couple of hours.<\/p>\n\n\n\n
The stumbling block for most people, myself included, is that we forget the 5’s are Red Herrings, hence my hack like switches. I burned a bit of time forgetting that piece of wisdom and trying to be cute. The basic trick is to divide by the 10’s and let the 5’s fall where they may.<\/p>\n\n\n\n
You really do have to have some kind of hack for the nines though.<\/p>\n\n\n\n
A really ingenious little geek would take this example and change the switches to make use of the QMap. Think about it. You just need a version of the QMap which is indexed by value not letter and you could do some _crazy_ stuff generating the strings.<\/p>\n\n\n\n
So, there you go. Take it, clean it up, rename everything in the editor and, most importantly do the other QMap for string creation. You will be ready to skip through a test you really shouldn’t have to take.<\/p>\n","protected":false},"excerpt":{"rendered":"
If you work long enough in IT you will start to really get tired of all the cutesy ways companies try to “select” developers\/consultants. Some of the worst ones send people to take on-line tests from commercial sites at the candidates own expense. I don’t see that much on reqs anymore. Why? Because only the most desperate of bottom feeders would do it. In truth the candidates were a good match because only a bottom … Roman Numeral Calculator<\/span>Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":6748,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,4],"tags":[1279,1280,1281],"class_list":["post-2012","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-information-technology","category-thank-you-sir-may-i-have-another","tag-on-line-tests","tag-programmer-test","tag-roman-number-calculator","bnm-entry"],"yoast_head":"\nRoman Numeral Calculator – Logikal Blog<\/title>\n<meta name=\"description\" content=\"A Roman Numeral calculator so you don't have to waste time on a pointless coding test. 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