Friend Function

-
#include <bits/stdc++.h>
using namespace std;
class rect
{
    int val;

public:
    friend void printLength(rect);
    // can be written in private also.
    friend int main();
    // we can also make main as a friend function.
    rect()
    {
        val = 10;
    }
};
void printLength(rect a)
{
    cout << a.val;
}
int main()
{
    rect a;
    cout << a.val;
    printLength(a);
}

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