#include <stdio.h>

void case1(void) {
  int a = 5, b = 2;
  int x = ++a + b++;
  printf("case 1: x = %d\n", x);  
}

void case2(void) {
  int a = 5, b = 2;
  int x = a-- + b-- * a;
  printf("case 2: x = %d\n", x);  
}

void case3(void) {
  int a = 5;
  int x = a % a-- + a * a;
  printf("case 3: x = %d\n", x);  
}

void case4(void) {
  int a = 5;
  int x = a-- - --a;
  printf("case 4: x = %d\n", x);  
}

int main(void) {
  case1();
  case2();
  case3();
  case4();
}