What does the C++ standard state the size of int, long type to be?

Question

I'm looking for detailed information regarding the size of basic C++ types. I know that it depends on the architecture (16 bits, 32 bits, 64 bits) and the compiler. But are there any standards for C++? I'm using Visual Studio 2008 on a 32-bit architecture. Here is what I get: char : 1 byte short : 2 bytes int : 4 bytes long : 4 bytes float : 4 bytes double: 8 bytes I tried to find, without much success, reliable information stating the sizes of `char`, `short`, `int`, `long`, `double`, `float` (and other types I didn't think of) under different architectures and compilers.

Answer 1

Hello,

1. char (signed of unsigned) has to be able to hold any UTF-8 character, so at least 8 bits.
2. short (signed or unsigned) [int] has to hold at least 16 bits.
3. int (signed or unsigned) has to hold at least 16 bits.
4. long (signed or unsigned) [int] has to hold at least 32 bits.
5. long long (signed or unsigned) [int] has to hold at least 64 bits.
6. float is typically IEEE-754, 32 bits.
7. double is typically IEEE-754, 64 bits.
8. long double is at least double.