Product Price Solver in C++

A simple program that I wrote using C++ to compute the product price in a grocery store using two-dimensional arrays, looping statements, and basic math operations.

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Program Listing

#include <iostream>

#include <iomanip>

// Jake Rodriguez Pomperada, MAED-IT, MIT

// jakerpomperada@gmail.com

using namespace std;

main() {

    string product[4] = {"Nido","Bear Brand",

                       "Anchor Milk", "Milo"};

    double price[4][1];

    double solve=0;

    double add=0,change=0, pay=0;

    cout <<"\n\n";

    cout << "Product Price Solver in C++";

     cout << "\n\n";

     for (int a=0; a<4; a++) {

       for (int b=0; b<1; b++)

       {

        cout << "Enter " <<product[a]

         << " price : ";

        cin >> price[a][b];

        add+=price[a][b];

       }

     solve= add;

     }

    cout << "\n\n";

    cout << "Total Amount Cost :=>" << fixed << setprecision(2) << solve;

    cout << "\n\n";

    cout << "Amount Payed : ";

    cin >> pay;

    change = (pay-solve);

    cout << "\n\n";

    cout << "Your change is Php : " << fixed << setprecision(2) <<change

        << ".";

    cout << "\n\n";

    system("pause");

 }