What is the correct type to use in Qt development (or C++ in general) for decimal arithmetic, i.e. the equivalent of System.Decimal struct in .Net?
There is no decimal type in C++, and to my knowledge, there is none provided by Qt either. Depending on your range of values, a decent solution may be to just use an unsigned int and divide/multiply by a power of ten when displaying it.
For example, if we are talking about dollars, you could do this:
unsigned int d = 100; // 1 dollar, basically d holds cents here...
or if you want 3 decimal places and wanted to store 123.456
unsigned int x = 123456; and just do some simply math when displaying:
printf("%u.%03u\n", x / 1000, x % 1000);