Code for printing report card of a student

#include <iostream.h>

#include <stdio.h>

#include <process.h>

struct students

{

    int rollno;

    char name[30];

    char clas[30];

    int maths;

    int cs;

    int phy;

    int eng;

    int chem;

}s[20];

int main()

{

    int i, num, rollnum, ch, mark[30], grad[30];

    char a[100];

    start:

    cout<<"\t PROGRESS ANALYSIS";

    cout<<"\n\n 1. Insert Marks";

    cout<<"\n 2. Display Marks";

    cout<<"\n 3. Exit";

    cout<<"\n\n press 1,2,3 as per your need";

    cin>>ch;

    switch(ch)

    {

        case 1 :

        {

            cout<<"\n\n How many students mark you need to enter";

            cin>>num;

            for(i=0;i<num;++i)

            {

                cout<<"\n\nEnter the details of the "<<i+1<<" student";

                cout<<"\n\nEnter the rollno. of the student";

                cin>>s[i].rollno;

                cout<<"\n\nEnter the name of the student";

                gets(a);

                gets(s[i].name);

                cout<<"\n\nEnter the class of the student";

                gets(s[i].clas);

                cout<<"\n\nEnter the mark of English of the student";

                cin>>s[i].eng;

                cout<<"\n\nEnter the mark of Maths of the student";

                cin>>s[i].maths;

                cout<<"\n\nEnter the mark of Physics of the student";

                cin>>s[i].phy;

                cout<<"\n\nEnter the mark of Computer of the student";

                cin>>s[i].cs;

                cout<<"\n\nEnter the mark of Chemistry of the student";

                cin>>s[i].chem;

                mark[i]=s[i].eng+s[i].maths+s[i].phy+s[i].cs+s[i].chem;

                grad[i]=mark[i]/5;

            }

            goto start;

            break;

        }

        case 2 :

            cout<<"\n\n Enter the rollno. of student to see his detail";

            cin>>rollnum;

            for(i=0;i<num;++i)

            {

                if(s[i].rollno==rollnum)

                {

                    cout<<"\n\n the name of the student";

                    puts(s[i].name);

                    cout<<"\n\nthe class of the student";

                    puts(s[i].clas);

                    cout<<"\n\nthe mark in English of the student"

                        <<s[i].eng;

                    cout<<"\n\nthe mark in Maths of the student"

                        <<s[i].maths;

                    cout<<"\n\nthe mark in Physics of the student"

                        <<s[i].phy;

                    cout<<"\n\nthe mark in Computer of the student"

                        <<s[i].cs;

                    cout<<"\n\nthe mark in Chemistry of the student"

                        <<s[i].chem;

                    cout<<"\n\n\n Total mark"

                        <<mark[i];

                    cout<<"\n\n Grade of the student";

                    if(grad[i]>90)

                        cout<<"A1";

                    else if(grad[i]>80 && grad[i]<=90)

                        cout<<"A2";

                    else if(grad[i]>70 && grad[i]<=80)

                        cout<<"B1";

                    else if(grad[i]>60 && grad[i]<=70)

                        cout<<"B2";

                    else if(grad[i]>50 && grad[i]<=60)

                        cout<<"C1";

                    else if(grad[i]>40 && grad[i]<=50)

                        cout<<"C2";

                    else if(grad[i]>30 && grad[i]<=40)

                        cout<<"D1";

                    else if(grad[i]<=30 )

                        cout<<"fail";

                }

                else

                    cout<<"the details of the student is not insterted";

            }

            break;

            case 3 :

                exit(1);

    }

    return 0;

}