fixed length data types in C/C++

Question

I\'ve heard that size of data types such as int may vary across platforms.

My first question is: can someone bring some example, what goes wrong, when p

Answer 1

Well, first example - something like this:

int a = 45000; // both a and b 
int b = 40000; // does not fit in 2 bytes.
int c = a + b; // overflows on 16bits, but not on 32bits

If you look into cstdint header, you will find how all fixed size types (int8_t, uint8_t, etc.) are defined - and only thing differs between different architectures is this header file. So, on one architecture int16_tcould be:

 typedef int int16_t;

and on another:

 typedef short int16_t;

Also, there are other types, which may be useful, like: int_least16_t