StuStruc

#include <iostream>
#include <string>
#include <sstream>
#include <iomanip>
using namespace std;


struct date
{
    int day, mon, yr;
};

struct student
{
    string id;
    string name;
    double totcre, grapo, cgpa;
    date dob;
};



double calcgpa (double gp, double cd);
struct date getdate ();
struct student getstu ();
void printstu (student a);



int main()
{
    int n, choice = 3, i;
    string temp;

    cout << "Number of Students: ";
    getline (cin, temp);
    stringstream (temp) >> n;

    struct student stu[n];


    while (choice != 0)
    {
        cout << "Enter 1 to Write information" << endl << "Enter 2 to Read information" << endl << "Enter 0 to Exit" << endl;
        getline (cin, temp);
        stringstream (temp) >> choice;

        if (choice == 1)
        {
            cout << "Enter the entry number to write: ";
            getline (cin, temp);
            stringstream (temp) >> i;

            if (i > 0 && i <= n)
                stu[i-1] = getstu();
            //for (i = 0; i < n; i++)
                //stu[i] = getstu();

            else
                cout << "Error! Invalid Entry Number";
        }

        else if (choice == 2)
        {
            cout << "Enter the entry number to read: ";
            getline (cin, temp);
            stringstream (temp) >> i;

            if (i > 0 && i <= n)
                printstu (stu[i-1]);
            //for (i = 0; i < n; i++)
                //printstu(stu[i]);
            else
                cout << "Error! Invalid Entry Number";
        }

        else if (choice == 0)
            break;
    }

    return 0;
}



double calcgpa (double gp, double cd)
{
    return (gp/cd);
}



date getdate ()
{
    date d;
    string temp;

    cout << "Enter the Birthday (DD MM YYYY): ";

    getline (cin, temp);
    stringstream (temp) >> d.day;
    getline (cin, temp);
    stringstream (temp) >> d.mon;
    getline (cin, temp);
    stringstream (temp) >> d.yr;

    return d;
}


student getstu ()
{
    student a;
    string temp;

    cout << "Enter Student ID: ";
    getline (cin, a.id);

    cout << "Enter Student's Name: ";
    getline (cin, a.name);

    a.dob = getdate ();

    cout << "Enter Total Credits Completed: ";
    getline (cin, temp);
    stringstream (temp) >> a.totcre;

    cout << "Enter Grade Point: ";
    getline (cin, temp);
    stringstream (temp) >> a.grapo;

    a.cgpa = calcgpa (a.grapo, a.totcre);

    cout << "Information of " << a.name << " has been stored successfully" << endl << endl;

    return a;
}



void printstu (student a)
{
    cout << left << setw(30) << "ID: " << a.id << endl;
    cout << left << setw(30) << "Name: " << a.name << endl;
    cout << left << setw(30) << "Date of Birth: " << a.dob.day << " - " << a.dob.mon << " - " << a.dob.yr << endl;
    cout << left << setw(30) << "Total Credits Completed: " << a.totcre << endl;
    cout << left << setw(30) << "Grade Point: " << a.grapo << endl;
    cout << left << setw(30) << "CGPA: " << left << setw(2) << a.cgpa << endl << endl;

    return;
}