FixedWidthTypes.c

#include <stdio.h>
#include <stdint.h>   // for fixed width types e.g. uint8_t, etc.
#include <inttypes.h> // for PRI{fmt}{type} and SCN{fmt}{type} macros

int main()
{
    uint32_t num;

    scanf("%"SCNu32, &num);

    printf ("%"PRIu32"\n", num);

    return 0;
}
/* * PRINTF * */
// Fixed Width types need to use PRI{fmt}{type} macro for use with printf
// where fmt is
//     (d)ecimal, (x)hex, (o)ctal , (u)nsigned, (i)nteger.
// and type is
//     N, FASTN, LEASTN, PTR, MAX
// where N corresponds to the number of bits in the arg (N=8,16,32,64).

/* * SCANF * */
// Fixed Width types need to use SCN{fmt}{type} macro for use with scanf.

// more info found here https://en.wikipedia.org/wiki/C_data_types#inttypes.h