A reference is a synonym for another variable. The value of the variable changes, if the value of variable or value of reference changes. Here is an example of reference.
#include<bits/stdc++.h>
using namespace std;
int main(){
int n = 50;
int& pn = n;
cout<<"n = "<<n<<" pn = "<<pn<<endl;
n = n+10;
cout<<"n = "<<n<<" pn = "<<pn<<endl;
pn = pn*2;
cout<<"n = "<<n<<" pn = "<<pn<<endl;
return 0;
}As the value of n changes, the value of rn changes. And as the value of rn changes, the value of n changes.
