An example where we return the value received by the wrapper function.

sum4.cpp

/* Prototypes */
int sum(int, int);
int wrapper(int, int);

/* Main program */

int main()
{
  
  int x = wrapper(1,1); //  We pass in the two values instead.

  return 0;
}

/* Program definition */

int wrapper(int xToAdd, int yToAdd){
  return sum(xToAdd, yToAdd);  //  z will become 2 here
}

int sum(int x, int y)
{
  return x+y;
}