Code-Cpp/tut28b.cpp at master · prathamlashkari/Code-Cpp · GitHub

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#include <iostream>
using namespace std;

class c2;
class c1
{
    int val1;

public:
    void indata(int a)
    {
        val1 = a;
    }
    void display(void)
    {
        cout << val1 << endl;
    }
    friend void exchange(c1 &x, c2 &y);
};

class c2
{
    int val2;

public:
    void indata(int a)
    {
        val2 = a;
    }
    void display(void)
    {
        cout << val2 << endl;
    }
    friend void exchange(c1 &x, c2 &y);
};

void exchange(c1 &x, c2 &y)
{

    int tem;
    tem = x.val1;
    x.val1 = y.val2;
    y.val2 = tem;
}

int main()
{
    c1 oc1;
    c2 oc2;

    oc1.indata(7);
    oc2.indata(9);

    exchange(oc1, oc2);
    cout << "The value of c1 after exchanging becomes: ";
    oc1.display();
    cout << "The value of c2 after exchanging becomes: ";
    oc2.display();
}