Square a value in C++

A simple program that I wrote in C++ that will square a number based on the number given by the user.

If you  have some questions please send me an email at jake.r.pomperada@gmail.com and jakerpomperada@yahoo.com. 

My mobile number here in the Philippines is 09173084360.

Program Listing

#include <iostream>

#include <iomanip>

 using namespace std;

// Global Variable

int values[6],a=0;

 void accept_data(void);

 void display_result(void);

 void accept_data()

 {

    for (a=1; a<=5; a+=1) {

          cout << "Enter Value No. "

               << a << " : ";

           cin >> a[values];

      }

 }

 void display_result()

 {

            cout << "\n\n";

            cout << setw(5)

                 << "VALUES"

                 << setw(18)

                 << "SQUARE VALUES";

            cout << "\n\n";

            for (a=1; a<=5; a+=1) {

           cout <<"\n" << setw(3) << a[values]

                << setw(16)

                << a[values] * a[values];

           }

        cout << "\n\n";

        system("pause");

 }

main() {

     cout << "\n\n";

     cout << "\t\t Square A Value Version 1.0";

     cout << "\n\n\n";

    accept_data();

    display_result();

 }