#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char *argv[])
{
    unsigned short int number;
    int i;

    printf("An unsigned short is %d bytes\n", sizeof (unsigned short int));
    printf("\n Num     Bit pattern\n");
    printf("       ----------------\n");
    printf("       5432109876543210\n\n");

    for (number = 0; number < 32; number++) /* what power set is this? */
    {
	printf("%3d == ", number);

	for (i = 15; i >= 0; i--)
	{
	    if (number & (1 << i)) /* true iff i'th bit is a 1 */
		printf("1");
	    else
		printf("0");
	}
	printf("\n");
    }

    return 0;
}