//
//  main.cpp
//  Ch5Ex8
//
//  Created by Bertoski on 10/01/12.
//  Copyright (c) 2012 Bertoski. All rights reserved.
// This program is used as a math tutor v.2

#include <iostream>
#include <iomanip>
#include <cstdlib>
#include <ctime>

using namespace std;


int main()
{
    int choice;//To hold menu choices
    float x = 10 + rand() % 1000;//Store x value
    float y = 1 + rand() % 1000;//Store y value
    float sum;// Store sum
    float difference;//Store difference
    float product;//Store product
    float quotient;//Store quotient
    float input; // Store input

    // Setting srand time
    srand(time(0));




    //Constants for menu choices
    const int ADDITION_CHOICE = 1,
              SUBTRACTION_CHOICE = 2,
              MULTIPLICATION_CHOICE = 3,
              DIVISION_CHOICE = 4,
              QUIT_CHOICE = 5;

    //Set the numeric output formatting.
    cout << fixed << showpoint << setprecision(2);

    do
    {

    //Display of Menu and Choices
    cout <<" \nMath tutoring problem generator\n\n"
         << "1. Addition \n"
         << "2. Subtraction \n"
         << "3. Multiplication \n"
         << "4. Division \n"
         << "5. Quit \n"
         << "Enter your choice (1-5): ";
    cin >> choice;



    //Responce to user selection.
    while (choice < ADDITION_CHOICE || choice > QUIT_CHOICE)
    {
        cout <<"\nThe valid choices are 1 through 5. Run the \n"
             <<"program again and select one of the choices.\n";
        cin >> choice;



    }

    //Process the user's choice.
    if (choice != QUIT_CHOICE)




    //Respond to the user's menu selection.
    switch (choice)
    {
        case ADDITION_CHOICE:
            cout <<"   " << x << endl; //Setting up random numbers
            cout <<" + " << y << endl; //Setting up random numbers
            cout << "_____________ \n";
            sum = (x + y);
            cin >> input;

            if(input!= sum)
            {
                cout <<"\nSorry the correct answer is : "<< sum << endl;
            }
            else
            {
                //Correct display message
                cout <<"\nCongratulations!!! \n";
                cout <<"You have answered the problem correctly! \n";
            }
            break;


        case SUBTRACTION_CHOICE:
            cout <<"   " << x << endl; //Setting up random numbers
            cout <<" - " << y << endl; //Setting up random numbers
            cout << "_____________ \n";
            difference = (x - y);
            cin >> input;

            if(input!= difference)
            {
            cout <<"Sorry the correct answer is : "<< difference << endl;
            }
            else
            {
                //Correct display message
                cout <<"\nCongratulations!!! \n";
                cout <<"You have answered the problem correctly! \n";
            }
            break;

        case MULTIPLICATION_CHOICE:
            cout << x; //Setting up random numbers
            cout <<" * " << y <<" = ? "<< endl; //Setting up random numbers
            product = (x * y);
            cin >> input;

            if(input!= product)
            {
            cout <<"Sorry the correct answer is : "<< product << endl;
            }
            else
            {
                //Correct display message
                cout <<"\nCongratulations!!! \n";
                cout <<"You have answered the problem correctly! \n";
            }
            break;

        case DIVISION_CHOICE:
            cout << x; //Setting up random numbers
            cout <<" / "<< y <<" = ? "<< endl; //Setting up random numbers
            quotient = (x / y);
            cin >> input;

            if(input!= quotient)
            {
            cout <<"Sorry the correct answer is : "<< quotient << endl;
            }
            else
            {
                //Correct display message
                cout <<"\nCongratulations!!! \n";
                cout <<"You have answered the problem correctly! \n";
            }
            break;

        case QUIT_CHOICE:
            cout <<"Program ending. \n";


        }


        } while (choice !=QUIT_CHOICE);

                        return 0;
}