tut22.cpp

#include<iostream>
using namespace std;
class c2;

class c1{
    int val1;
    friend void exchange(c1 & , c2 &);
    public:
    void intdata(int a){
        val1= a;
    }
    void display(void){
        cout<<val1 <<endl;
    }
};
class c2{
    int val2;
    friend void exchange(c1 & , c2 &);
    public:
    void intdata(int a){
        val2= a;
    }
    void display(void){
        cout<<val2 <<endl;
    }
};
void exchange( c1 & x , c2 & y){
    int tmp= x.val1;
    x.val1= y.val2;
    y.val2= tmp;
    
}
int main(){

    c1 oc1;
    c2 oc2;

    oc1.intdata(34);
    oc2.intdata(64);
    exchange(oc1, oc2);

    cout<<"the value of c1 afterexchanging becomes :";
    oc1.display();
    cout<<"the value of c2 afterexchanging becomes :";
    oc2.display();
    return 0;
}