Program to illustrate Call by Reference

          #include <iostream.h>
          #include <conio.h>
           void swap2 (int*i, int*j);                         // Function prototype 
           void main( )
          {
            int a = 5, b =25 ;
            swap2 (&a, &b);          // Call by passing addresses of variables
            cout<<"\n a = "<<a<<"\t b = "<<b;
            getch( );
           }
           void  swap2 (int *x, int *y)                              // Function definition
        {
            int temp;
                          // To interchange 2 numbers
            temp = *x;
            *x = *y;
            *y = temp ;
            }