C++ friend functions and friend classes.

This is 1 of full programming  Example by using friend class function

#include <iostream>

using namespace std;

class CoreographMarks

{

    public:

    float points;

    float total;

    CoreographMarks()

    {

        total =30;

    }

    void setCgPoints()

    {

        cout<<"Enter Coreograph Marks   [max:30]: ";

        cin>>points;

    }

    friend class FigureSkater;

};

class ArtisticMarks

{

    public:

    float points;

    float total;

    ArtisticMarks()

    {

        total =20;

    }

    void setArtPoints()

    {

        cout<<"Enter Artistic Marks     [max:20]: ";

        cin>>points;

    }

    friend class FigureSkater;

};

class FigureSkater

{

    public:

    string name;

    int age;

    float finalpoints, cpoints, apoints, mpoint, m2point;

    CoreographMarks mark;

    ArtisticMarks mark2;

    void set_detail()

    {

        cin.clear();

        cin.ignore();

        cout << "Enter name      : ";

        getline(cin, name);

        cout << "Enter age       : ";

        cin>>age;

    }

    void calcFinalPoints()

    {

        mark.setCgPoints();

        mark2.setArtPoints();

        cpoints = (mark.points/mark.total)*100;

        apoints = (mark2.points/mark2.total)*100;

        finalpoints = ((mark.points+mark2.points)/(mark.total+mark2.total))*100;

    }

    int getAge()

    {

        return age;

    }

    string getName()

    {

        return name;

    }

    void displayScoreDetail()

    {

        cout << "Coregraphy   : "<<cpoints<<endl;

        cout << "Artistic     : "<<apoints<<endl;

        cout << "Final Score  : "<<finalpoints<<endl;

    }

};

int main()

{

    int num;

    CoreographMarks *core;

    ArtisticMarks *art;

    FigureSkater ska[100];

    cout << "Enter number of figure skaters"<<endl;

    cin>>num;

    core = new CoreographMarks[num];

    art = new ArtisticMarks[num];

    for(int i=0; i<num; i++)

    {

        cout<<"::::Setting details for figure skater::::"<<endl;

        ska[i].set_detail();

        ska[i].calcFinalPoints();

        cout <<"-------------------------------------------"<<endl;

        cout<<endl;

        cout<<"============================================"<<endl;

        cout << "Figure Skater "<<i+1<<endl;

        cout << "==========================================="<<endl;

        cout << "Name   = "<< ska[i].getName() <<endl;

        cout << "Age    = "<< ska[i].getAge() <<endl;

        cout<<endl;

        cout <<"::::Details of scoring::::"<<endl;

        cout<<endl;

        cout<<endl;

        ska[i].displayScoreDetail();

        cout<<endl;

        cout<<endl;

    }

        delete []core;

        delete []art;

    return 0;

}