Cpp-codes/tut28b.cpp at main · Tethet-18/Cpp-codes · GitHub

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#include<bits/stdc++.h>
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 temp=x.val1;
    x.val1=y.val2;
    y.val2=temp;
}
int main(){
    c1 oc1;
    c2 oc2;

    oc1.intdata(34);
    oc2.intdata(67);
    exchange(oc1,oc2);

    cout<<"the value of c1 after exchanging becomes: ";
    oc1.display();
    cout<<"the value of c2 after exchanging becomes: ";
    oc2.display();

    return 0;
}