AVERAGE MARKS of STUDENTS using a FRIEND CLASS

6. Write a program to find total and average marks of each student in class. Create a student class with student number, name, 6 subject marks as its members and initializes the details. Use friend class that access the details of student and calculates total, average marks and prints the result.

            // AVERAGE MARKS of STUDENTS using a FRIEND CLASS

#include<iostream.h>

class student

{

            int number, marks[6], total;

            char name[20];

            float avg;

      public:

            void initialize();

            friend class fstudent;

};

class fstudent       // friend class

{

       public:

            void totavg(student &);

            void display(student);

};

void student::initialize() 

{

            int i;

            cout<<"Number: ";    cin>>number;

            cout<<"Name: ";        cin>>name;

            cout<<"Marks in 6 Subjects: ";

            for(i=0; i<6; i++) cin>>marks[i];

}

void fstudent::totavg(student & st1) 

{

            int i,sum=0;

            for(i=0; i<6; i++)         sum=sum+st1.marks[i];

            st1.total=sum;

            st1.avg=st1.total/6.0;

}

void fstudent::display(student st2) 

{

            int i;

            cout<<st2.number<<" "<<st2.name<<" ( ";

            for(i=0; i<6; i++) cout<<st2.marks[i]<<" ";

            cout<<") "<<st2.total<<" "<<st2.avg<<endl;

}

int main() 

{

            student st[5]; 

            fstudent fst; 

            int number,i;

            cout<<"No. of Students: ";

            cin>>number;

            for(i=0; i<number; i++)

            {

                        cout<<"Student "<<i+1<<"\n";

                        st[i].initialize();

            }

            for(i=0; i<number; i++)                       

            fst.totavg(st[i]);

            cout<<"\nNumber, Name, Marks, Total and Average of ";

            cout<<number<<" students:\n";

            cout<<"-----------------------------------------------------\n";

            for(i=0; i<number; i++)                       

            fst.display(st[i]);

}