Exact-width integer types in C (stdint.h)

Question

I would like char, short and int types to be 1, 2 and 4 bytes width. I have included a stdint.h header into my sources. Does this guarantee that int8_t, int16_t and int32_t integer types will be of widths specified? What is the best way to achieve this?

Answer 1

If these types exist, they have the correct width and are encoded in two's complement.

Edit: you should be able to check if the types exist with something like

#ifdef INT32_MAX
...
#endif

but on all end user architectures (PC etc) these types do usually exist.