#include<iostream>
using namespace std;

int student_descriptoin();
int result_maker();
int gpa_maker(int roll);

class result
{
private:
    char name[100];

    int serial_no;
public:
    int roll;
    float cgpa=0;
    float credit=0;
    float gpa=0;
    void details(int i)
    {
        serial_no=i+1;
        cout<<"\nname:";
        cin>>name;
        cout<<"roll:";
        cin>>roll;

    }
    void print_result()
    {
        cout<<"serial no:"<<serial_no<<endl;
        cout<<"name:"<<name<<endl;

        cout<<"roll:"<<roll<<endl;

        cout<<"cgpa:"<<cgpa<<endl;
    }

};
result ob[10000];
static int n;

int main()
{
    int i;
    student_descriptoin();
    result_maker();


     cout<<"\nlist of result:\n";ft
    for(i=0;i<n;i++)
    ob[i].print_result();


}

int student_descriptoin()
{
    int i;
    cout<<"\nHOW MANY STUDENTS:";
    cin>>n;
    cout<<"\nput students details:\n";
    for(i=0;i<n;i++)
    {
        ob[i].details(i);
    }

}
int result_maker()
{
    int rol,i;
    cout<<"\n\nINPUR RESULT:\n";
    for(i=0;i<n;i++)
    {
        cout<<"put roll:";
        cin>>rol;
        gpa_maker(rol);

    }

}
int gpa_maker(int rol)
{
    int no,x,i;
    float a,c,gpa,sum=0,credit=0;
    cout<<"\nput the no. of sub:";
    cin>>no;
    for(i=1;i<=no;i++)
    {
        cout<<"subject no. "<<i<<":"<<endl;
        cout<<"gpa:";
        cin>>a;
        cout<<"credit:";
        cin>>c;
        sum=sum+a*c;
        credit=credit+c;
    }
    for(i=0;i<n;i++)
    {
        x=ob[i].roll;
        if(rol==x)
        {
            ob[i].gpa+=sum;
            ob[i].credit+=credit;
            ob[i].cgpa=ob[i].gpa/ob[i].credit;
        }
    }

}