C++ Pass By Reference

#include<iostream>
using namespace std;
void anik(int *a)
{
    *a = 70;
}
int main()
{
    int n = 20;
    cout << "Before Calling The Function :: " << n << endl << endl;

    anik(&n);

    cout << "After Calling The Function :: " << n << endl;

    return 0;
}