#include <iostream.h>

void swap(double *, double *);      // function prototype

int main()
{
  double firstnum = 20.5, secnum = 6.25;

  swap(&firstnum, &secnum);           // call swap

  return 0;
}

// this function illustrates passing pointer arguments
void swap(double *nm1Addr, double *nm2Addr)
{

  cout << "\nThe number whose address is in nm1Addr is "
       << *nm1Addr << endl;
  cout << "The number whose address is in nm2Addr is "
       << *nm2Addr << endl;

  return;
}