// ***********************************************************************
//  File:  <mathtutor2.cpp>
//
//        <module name> - <description>
//
//   Author:  <Julia Coleman>
//  Created:  <01/24/2011>
//  Updated:  N/A
//
//  Assignment:  <lab 2>
//    Compiler:  < >
//
// *********************************************************************
//      Inputs: <seed, answer, remainder>
//
//     Outputs: <num1, num2>
//
// Constraints: <>
//
// *********************************************************************
// Design
//   <Int main
//      Int operation, num1, num2, answer, remainder
//      Unsigned seed
//
/**      Get user to input integer
		If number is a valid number say thanks
		If number is not a valid number, end program
	Ask user which operation they would like to perform
		(Addition, Subtraction, Multiplication, and Division)
			If addition, add random numbers
			If subtraction, subtract random numbers
			If multiplication, multiply random numbers
			If division, divide random number
		For all, ask for input and then tell them if it's the right or
		wrong answer. If it is a wrong answer tell them the right one.
*/

#include <iostream>
#include <cstdlib>
#include <iomanip>
using namespace std;

int main()
{
	int operation, num1, num2, answer, remainder,continuity;
	unsigned seed;


	srand (seed);
	cout <<"Please enter a number that is greater than 0: \n";
	cin >> seed;
	if (seed > 0)
        cout << "Thank you\n\n";
    	else
  	  {
    	    cout << "That is not a valid input\a";
   	     return 0;
   	 }
  	  num1 = 0 + rand() % 9999;
  	  num2 = 0 + rand() % 9999;

	//ask user which math operation they would like to preform
	cout <<"Math Tutorial Program\n";
	cout <<"1. Addition\n";
	cout <<"2. Subtraction\n";
	cout <<"3. Multiplicatio\n";
	cout <<"4. Division\n";
	cout <<"Press Q to quit\n";
	cout <<"Which math operation would you like to practice?\n";
	cin >> operation ;
                if (operation > 0)
                    cout << "\n";
                else
                {
                cout << "That is not a valid input";
                    return 0;
                }
	switch (operation)
	{
		case 1: cout << num1 <<endl;
			cout << "+" <<num2 << endl;
			cout << "_____\n";
			cin >> answer;
                if (answer > 0)
                    cout << "\n";
                else
                {
                cout << "That is not a valid input";
                    return 0;
                }
           		 if (answer == num1 + num2)
               			 cout<<"Good Job! That is correct!\n";
           		 else
               			 cout<<"Sorry. The answer is: "<< num1 + num2<<endl;
               				 break;
		case 2: cout << num1 <<endl;
			cout << "-" <<num2 << endl;
			cout << "_____\n";
			cin >> answer;
                if (answer > 0 || answer < 0)
                    cout << "\n";
                else
                {
                cout << "That is not a valid input";
                    return 0;
                }
                    if (answer == num1 - num2)
               			 cout<<"Good Job! That is correct!\n";
            		else
                		cout<<"Sorry. The answer is: "<< num1 - num2<<endl;
                			break;
		case 3: cout << num1 <<endl;
			cout << "x" <<num2 << endl;
			cout << "_____\n";
			cin >> answer;
                if (answer > 0 || answer < 0)
                    cout << "\n";
                else
                {
                cout << "That is not a valid input";
                    return 0;
                }
                    if (answer == num1*num2)
                		cout <<"Good Job! That is correct!\n";
                    else
                		cout <<"Sorry. The answer is: "<< num1*num2<<endl;
                    			break;
		case 4:
           		cout << "The program will ask you for the whole number and then the remainder.\n";
            			if(num1<num2)
               			num1=num2+23;
            			cout << num1 << "/" <<num2 << "=" <<endl;
                cin >> answer;
                    if (answer > 0 || answer < 0)
                    cout << "\n";
                    else
                    {
                    cout << "That is not a valid input";
                        return 0;
                    }
			cout << "What is the remainder of " << num1 <<"/"<<num2 <<"? ";
			cin >> remainder;
            		if (answer > 0 || answer < 0)
                    cout << "\n";
                    else
                    {
                    cout << "That is not a valid input";
                        return 0;
                    }
            		if (answer == num1/num2 && remainder == num1%num2)
                		cout << "Good Job! That is correct!\n";
            		else
                		cout << "Sorry the answer is " <<num1/num2 <<" r "<<num1%num2 <<endl;
                    			break;
            case 'Q': cout <<"Thanks!";
                        return 0;
        	default: cout << "1,2,3,4 and Q are the only valid choices.";
	}

	}