#include <iostream>

 int main()
 {
     int a=0, b=0, x=0, y=35;
     std::cout << "before a: " << a << " b: " << b;
     std::cout << " x: " << x << " y: " << y << std::endl;
     a = 9;
     b = 7;
     y = x = a+b;
     std::cout << "after a: " << a << " b: " << b;
     std::cout << " x: " << x << " y: " << y << std::endl;
     return 0;
 }