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.

Answer 1

There is standard.

C90 standard requires that

sizeof(short) <= sizeof(int) <= sizeof(long)

C99 standard requires that

sizeof(short) <= sizeof(int) <= sizeof(long) <= sizeof(long long)

Here is the C99 specifications. Page 22 details sizes of different integral types.

Here is the int type sizes (bits) for Windows platforms:

Type           C99 Minimum     Windows 32bit
char           8               8
short          16              16
int            16              32
long           32              32
long long      64              64

If you are concerned with portability, or you want the name of the type reflects the size, you can look at the header , where the following macros are available:

int8_t
int16_t
int32_t
int64_t

int8_t is guaranteed to be 8 bits, and int16_t is guaranteed to be 16 bits, etc.