/*
**	add - binary addition table generation program
**	written by Joseph B. Evans, 11/11/91
*/
#include <stdio.h>
#include <math.h>

#define MAXRAND 2147483647.	/* maximum random number for random() */
#define LIMIT 0.001		/* limits on uniform distribution */

main(ac,av)
int ac;
char **av;
{
	int x,y,ci,z;
	int xbits,ybits,zbits;
	int cflag = 0;
	double u;

	if (ac == 2) cflag = 1;
	else if (ac > 2) {
		fprintf(stderr,"usage: %s [-c]\n",av[0]);
		fprintf(stderr,"          -c gives a carry in\n");
	}

        xbits = 8; ybits = 8; zbits = 9;
        for (ci=0; ci <= cflag; ci++) {
        	for (x=0; x < (1<<xbits); x++) {
        		for (y=0; y < (1<<ybits); y++) {
				/* generate uniform random variables */
				u = (double)random()/MAXRAND;
				if ((u > 0.5-LIMIT)&&(u < 0.5+LIMIT)) {
					z = x+y+ci;
					printf("b");
                			print_binary(x,xbits);
					printf(" b");
					print_binary(y,ybits);
					if (cflag == 1) {
						printf(" b");
						print_binary(ci,1);
					}
					printf("\tb");
					print_binary(z,zbits);
        	        		printf("\n");
        			}
        		}
        	}
        }
}