C++ LANGUAGE REFERENCES AS PARAMETERS

COMPUTER LANGUAGES HTML,C,C++.JAVA,.NET AND MULTIMEDIA basics and programs click home button

C++ LANGUAGE REFERENCES AS PARAMETERS

References as Parameters 


We have discussed how we implement call by reference concept using 
pointers. Here is another example of call by reference which makes 
use of C++ reference: 

#include <iostream> 

using namespace std; 
  
// function declaration 
void swap(int& x, int& y); 
  
int main () 
{ 
   // local variable declaration: 
   int a = 100; 
   int b = 200; 
  
   cout << "Before swap, value of a :" << a << endl; 
   cout << "Before swap, value of b :" << b << endl; 
  
   /* calling a function to swap the values.*/ 
   swap(a, b); 
  
   cout << "After swap, value of a :" << a << endl; 
   cout << "After swap, value of b :" << b << endl; 
  
   return 0; 
} 
  
// function definition to swap the values. 
void swap(int& x, int& y) 
{ 
   int temp; 
   temp = x; /* save the value at address x */ 
   x = y;    /* put y into x */ 
   y = temp; /* put x into y */ 
   
   return; 
} 
When the above code is compiled and executed, it produces the following result: 
Before swap, value of a :100 
Before swap, value of b :200 
After swap, value of a :200 
After swap, value of b :100