SOURCE FILE: 07RefPrmSrtr.cpp

/* Example of the use of reference parameters to change variable
   valuess.  */
   
#include <iostream>

using namespace std ;
   
void swap (int &, int &) ;
void sort (int &, int&, int&) ;
void getValues (int &, int&, int&) ;
void writeValues (int &, int&, int&) ;

int main(void)   
{   
   int val1, val2, val3 ;

   getValues(val1, val2, val3) ;
   sort (val1, val2, val3) ;
   cout << "In sorted order, the values are: " << endl ;
   writeValues (val1, val2, val3) ;
   return 0;
}   
   

/* Switch the values of x and y */
void swap (int & x, int & y)
{
  int temp = x ;
  x = y ;
  y = temp ;
}

/* Input three numbers and return the same three in ascending order. */
void sort (int & a, int& b, int& c)
{
  if (a > b) swap (a,b) ;
  if (b > c) swap (b,c) ;
  if (a > b) swap (a,b) ;
}

void getValues (int & i, int& j, int& k)
{
  cout << "Please enter three integers (in any order): " ;
  cin >> i >> j >> k ;
}

void writeValues (int & r, int& s , int& t)
{
  cout << " First: " << r << endl ;
  cout << "Second: " << s << endl ;
  cout << " Third: " << t << endl ;
}