How do I specfy an int32_t output parameter with a scanf format on a 64-bit processor?

Question

If int is 64 bits, can I assume, that %d produces int? What is then %hd, %ld, %lld and what if I want int32_t as output?

Answer 1

In the "inttypes.h" header are a number of macros for format specifiers to be used for fixed width types, regardless of environment

For a int32_t printed in decimal format, you would use the PRId32 macro. For example:

int32_t x;
printf("x = %" PRId32 "\n", x);

This macro expands to a string containing the d format specifier and any necessary size modifiers. The above code also takes advantage of the compiler merging strings that appear one after the other.