#include <stdio.h>

union Little_big {
    short int i;        // 16 bit
    char c[2];          // 8 bit, 8 bit
};

int main (void)
{
    union Little_big lb;
    lb.i = 0x1234;
    printf ("%x %x%x\n", lb.i, lb.c[0], lb.c[1]);
    return 0;
}