//swapper
//reference parameters vs value parameters
//function overloading
#include <iostream> 
  //for cin, cout, endl
using namespace std;

//a function with value parameters
void badswap(int x, int y);

//a function with reference parameters
void goodswap(int &x, int &y);
  // could be 
  // int& x, OR int & x, OR int &x

void goodswap(float &x, float &y);  
  // overloading goodswap

int main()
  {
  int a=5;
  int b=10;
  cout << "Before function calls:\n"
    << "a= " << a << "  b= " << b << endl;

  badswap(a, b);
  cout << "After call to badswap:\n"
    << "a= " << a << "  b= " << b << endl;

  goodswap(a, b);
  cout << "After call to goodswap:\n"
    << "a= " << a << "  b= " << b << endl;

  badswap(2,50);
  //goodswap(2,5);//where do the labels x and y go?

  //Now for floats
  float p=3.14;
  float q=2.7;
  cout << "Before float function calls:\n"
    << "p= " << p << "  q= " << q << endl;
  goodswap(p,q); //which function is called?
  cout << "After call to float goodswap:\n"
    << "p= " << p << "  q= " << q << endl;

  badswap(p,q); //what happens here?
  return 0;
  }

void badswap(int x, int y)
  {
  int temp;
  temp=x;
  x=y;
  y=temp;
  cout << "At end of badswap, before return:\n"
    << "x= " << x << "  y= " << y << endl;
  return;
  }

void goodswap(int &x, int &y)
  {
  int temp;
  temp=x;
  x=y;
  y=temp;
  cout << "At end of goodswap, before return:\n"
    << "x= " << x << "  y= " << y << endl;
  return;
  }

void goodswap(float &x, float &y)
  {
  float temp;
  temp=x;
  x=y;
  y=temp;
  cout << "At end of goodswap for floats,"
    << "before return:\n"
    << "x= " << x << "  y= " << y << endl;
  return;
  }