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Pointers, need opinions

kerolz94 (7)
Hi guys~
so i got this assignment that wants me to create a program using File I/O and Pointers
so me & my friend have created this exam results program..File I/o part is good..but we still don't know where to put the pointers..in your opinion, which part in this code can i put pointers and how?

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// File Header
#include <iostream>
#include <cstdlib>
#include <fstream>
#include <cmath>
#include <string>
#include <iomanip>
using namespace std;


// Function Prototype
void intro();
void about();


// Main Function
int main()
{
    //Declare Variable
    //string number[20];
    string name[20];
    string program[20];
    string subject[20],subject1[20],subject2[20],subject3[20];
    string ID[20];
    double GPA,credit[20],credit1[20],credit2[20],credit3[20],pointer[20],pointer1[20],pointer2[20],pointer3[20];
    double loop;


    //read and write file
    ifstream readData("database.dat");
    ofstream writeData("Student Information.txt");

    intro();
    system("cls");


    for (loop = 0; loop<20; loop++)
    {
        readData>>name[loop]>>ID[loop]>>program[loop]>>subject[loop]>>credit[loop]>>pointer[loop]>>subject1[loop]>>credit1[loop]>>pointer1[loop]>>subject2[loop]>>credit2[loop]>>pointer2[loop]>>subject3[loop]>>credit3[loop]>>pointer3[loop];
   



        GPA = ((credit[loop] * pointer[loop]) + (credit1[loop] * pointer1[loop]) + (credit2[loop] * pointer2[loop]) + (credit3[loop] * pointer3[loop]))/(credit [loop]+credit1[loop]+credit2[loop]+credit3[loop]) ;


       writeData<< "=============================== "<<"Student Information " << loop+1<< " ================================"
       <<"\nName: \t\t\t"<<name[loop]<<"\nStudent ID: \t\t"<<ID[loop]<<"\nProgram: \t\t"<<program[loop]
       <<"\nSubject: \t\t"<<subject [loop]<<"\nCredit Hour: \t\t"<<credit [loop]<<"\nPointer: \t\t"<< fixed << setprecision(2)<<pointer [loop]
       <<"\nSubject: \t\t"<<subject1[loop]<<"\nCredit Hour: \t\t"<<credit1[loop]<<"\nPointer: \t\t"<< fixed << setprecision(2)<<pointer1[loop]
       <<"\nSubject: \t\t"<<subject2[loop]<<"\nCredit Hour: \t\t"<<credit2[loop]<<"\nPointer: \t\t"<< fixed << setprecision(2)<<pointer2[loop]
       <<"\nSubject: \t\t"<<subject3[loop]<<"\nCredit Hour: \t\t"<<credit3[loop]<<"\nPointer: \t\t"<< fixed << setprecision(2)<<pointer3[loop]
       <<"\nGrade Pointer Average: \t" << fixed << setprecision(2) << GPA << "\n";



    }



    about();
    return 0;
}

void intro(){

    cout << "\n\n\n\n\n\n\n";
    cout << "\t* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *\n";
    cout << "\t*        Welcome To Student Exam Information System         *\n";
    cout << "\t*                                                           *\n";
    cout << "\t*                This Program Developed By                  *\n";
    cout << "\t*                Iqmal Azim & Khairul Aiman                 *\n";
    cout << "\t*              Press Enter Button To Continue..             *\n";
    cout << "\t*                                                           *\n";
    cout << "\t* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *\n";
    cin.get();
}

void about(){
    cout << "==============================================================================" << endl;
    cout << "This program will help you to calculate the student GPA base on the input data" << endl;
    cout << "==============================================================================" << endl;
    cout << "" << endl;
    cout << "" << endl;
    cout << "The data has been calculated" << endl;
    cout << "Please open the file name Student Exam Information....." << endl;
    cout << "" << endl;
}
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