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?
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?
Neither C++ standard library nor Qt has any data type equivalent to System.Decimal in .NET.
Does Qt provide a built-in struct? (I can't find it in the docs, but maybe don't know where to look.)
No.
Is there a "standard" C++ library to use?
No.
But you might want to have a look at the GNU Multiple Precision Arithmetic Library.
[EDIT:] A better choice than the above library might be qdecimal. It wraps an IEEE-compliant decimal float, which is very similar (but not exactly the same as) the .NET decimal, as well utilizing Qt idioms and practices.
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.%u\n", x / 1000, x % 1000);
No idea about Qt, but there is a decimal floating point library from Intel.
A quick search turns up that gcc may support decimals directlyand that far more general information is available at for instance http://speleotrove.com/decimal/
There is also an implementation in C, available from IBM : http://www.alphaworks.ibm.com/tech/decNumber
