Programming in C++, 2nd Edition

150 C++ Declarations

4.41 Write a program to declare reference variable to const variable.

#include<iostream.h>

#include<conio.h>

#include<math.h>

int main()

{

clrscr();

const int x=15;

int & y=x;

cout<<“ x = ”<<x << “ y = ”<<y;

y=25;

cout<<“\n x = ”<<x <<“ y = ”<<y;

return 0;

}

OUTPUT

x = 15 y = 15

x = 15 y = 25

Explanation: In the above program, integer x is a constant variable and initialized with 15. The

variable y is a reference variable to variable x. We cannot change the value of x as it is a constant

variable. But we can change the value of its reference variable. The change in reference variable

does not change the value of constant v ...