Reference:
A reference in C++ is an alias or a new name for an existing variable. A way to access a variable without actually copying its value is known as this. The declaration uses the ampersand symbol (&) to indicate a reference.
Example:
#include <iostream>
using namespace std;
int main() {
int x = 10;
int& y = x; // y is a reference to x
cout << "x = " << x << endl;
cout << "y = " << y << endl;
y = 20; // changes the value of x
cout << "x = " << x << endl;
cout << "y = " << y << endl;
return 0;
}
Output:
x = 10
y = 10
x = 20
y = 20
