Read one byte at a time and print the value

byte.c

#include <stdio.h>


int main(int argc, char **argv)
{
    int i = 0;
    int g = 0;
    unsigned char ch;

    if (argc > 1) {
        g = atoi(argv[1]);
    }

    for (i = 0; i < g; i++) {
        fread(&ch, 1, 1, stdin);
    }

    ch = 0;
    fread(&ch, 1, 1, stdin);
    printf("%#04x\n", ch);

    return 0;
}