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("%c & ", ((i & (1 << j)) >> j)?'T':'F');
    putchar('\n');
  }

  return EXIT_SUCCESS;
}