// Showing that functions get a copy of values passed in.
//
// g++ -o add2nums add2nums.cpp
//

#include <iostream.h>

// here is the definition of the function add2nums
//

int add2nums( int firstnum, int secondnum ) {
  int sum;

  sum = firstnum + secondnum;

  // just to make a point

  firstnum = 0;
  secondnum = 0;

  //
  return(sum);
}



int main(void) {

  int y,a,b;

  cout << "Enter 2 numbers\n";

  cin >> a >> b;


  y = add2nums(a,b);

  cout << "a is " << a << endl;
  cout << "b is " << b << endl;
  cout << "y is " << y << endl;
  return(0);
}