C program to generate LaTeX truth tables

wtab.c

/* ./wtab n
 * creates a truth table for LaTeX with n bits
 */

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

#define SIZE unsigned long
#define MAXBITS sizeof(SIZE)*8-1

int main(int argc, char *argv[]) {
	SIZE i;
	int j, cols;

	if (argc != 2 || (cols = atoi(argv[1])) <= 0 || cols > MAXBITS) {
		fprintf(stderr, "wrong column count (max %d)\n", MAXBITS);
		return EXIT_FAILURE;
	}

	for (i = 0; i < (1 << cols); i++) {
		for(j = cols-1; j >= 0; j--)
			printf("%d & ", ((i & (1 << j)) >> j));
		putchar('\n');
	}

	return EXIT_SUCCESS;
}