Function in C++

Simple example of Function in C++, which explain the working of call by pointer/call by address:

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