#include <stdio.h>

int main(void) {

  int a, b, c, d;

  a = b = c = d = 7;  /* a = (b = (c = (d = 7)))  */
  printf("a: %d, b: %d, c: %d, d: %d\n", a,b,c,d);
  
  a = (b = 2) + (c = 3) - (d = 1);
  printf("a: %d, b: %d, c: %d, d: %d\n", a,b,c,d);
  
  return 0;
}