Function in C++

Simple example of Function in C++, which explain the working of call by reference:

Program Code:

#include <iostream>
using namespace std;
int hello(int &x)
{ 
x=x+10;
cout<<x;
return x;
}
int main()
{    
int x;   
cin>>x; 
cout<<x;
cout<<endl;   
hello(x);   
cout<<endl;   
cout<<x;
}

The output of the program is tested on www.jdoodle.com

Output:

10
20
20

Thanks

Mukesh Rajput