Fixed width integer types (since C99)
# Example
#include <inttypes.h>
#include <stdio.h>
int main(void)
{
printf("%zu\n", sizeof(int64_t));
printf("%s\n", PRId64);
printf("%+" PRId64 "\n", INT64_MIN);
printf("%+" PRId64 "\n", INT64_MAX);
int64_t n = 7;
printf("%+" PRId64 "\n", n);
}