#include <iostream>
using namespace std;

int main()
{
    int x1 = 5 ;
    int y1 = 5 ;
    int z1 ;

    //x1 is still 5 and y1 becomes 6 so z1 is 11
     z1 = x1++ +  ++y1 ;
     //z1 11
     //Now x1 is 6  y1 is 6
    //z1 prints 11
    cout << "z1 = " << z1 << endl ;
    //x1 is 6 and y1 is 6
     z1 = x1++ +  y1++ ;
     //z1 is 12
      // x1 is now 7 and y1 is 7
      cout << "z1 = " << z1 << endl ;

      z1 = x1 +  y1 ;
      //z1 is now 14
      cout << "z1 = " << z1 << endl ;
      //z1 is still 14 and will only change it's value
      // after the conditional expression
        if ( z1++ == 14 )
             z1++ ;
     //After the conditional expression z1 is 15 and now we have another "++" so z1 is 16
      ++z1 ;  //Now z1 is 17
     cout << "z1 = " << z1 << endl ;
         //17


  }