#include <stdio.h>
#define MAX 13

int main(void) {
  int v = 0, i = 1, m, n;
 
  /* Three bad examples */
  v = 5, 7;
  printf("v = %d\n", v);

  v = (5, 7);
  printf("v = %d\n", v);

  v = (i++, v + i);
  printf("i = %d, v = %d\n\n", i, v);


  /* One fine example */
  for (m = 1, n = MAX; m <= n; m++, n--)
    printf("m = %d, n = %d\n", m, n);
    
  return 0;
}