#include <iostream>       // here cout is defined       

int main()  
{                         // ALL BEGINS
  int i,j;                // integers i and j
  i=5;                    // set values to i and j 
  j=20;
  int k=i+j;              // define k on the fly
  std::cout<<"k="<<k<<"\n";    // output to screen
}                         // ALL ENDS