Employing the correct sized integers for portability, continued

When using standard C functions like printf() and sscanf(), we can employ C's ability for the compiler (i.e. at compile-time, not run-time) to concatenate string constants. Within the <inttypes.h> header file, PRIi64 may be, for example, defined as the string "i" or "li" depending on the target environment's architecture:

#include <stdint.h>
#include <inttypes.h>

    int64_t    nbytes;
    ....
    printf("%" PRIi64 "MB\n", n / (1 << 20) );

Similar support exists within the C99 and C11 standards for varying sized pointers (typically 32- or 64-bits), the ability to perform I/O on their character (string) representations, and to select the appropriate sized integer so that it may hold a pointer value.