Virginia Standard Code for Information Integration

vscii.c

#include <stdio.h>
/* Virginia Standard Code for Information Integration */
int main(int argc, char **argv) {
  int i, j;
  for (i = 1; i < 3*3*3; i++) {
    printf("%c ", i + 96);
    for (j = 5 - 1; j >= 0; j--) {
      putchar(i & (1u << j) ? '1' : '0');
    }
    printf("\n");
  }
  return 0;
}