#include "pch.h"
#include <iostream>
#include<string>
using namespace std;

int main()
{

	double Num1;
	double Num2;
	int Operation;
	int Reply;

	double Result;
	cout << " \t \t \t  \t  welcome to Calculator\t \t \t  \t  " << endl;

	startingpoint:

		//TAKE THE INPUT FROM USER //

	cout << "please enter two numbers \n" << endl;
	cin >> Num1 >> Num2;

	//CHECK THE VALIDATE OF NUMBERS//

	if (cin.fail())
	{

		cin.clear();
		cin.ignore(10000, '\n');

		goto startingpoint;

	}

	// TAKE THE OPERATION FROM USER//

	chooseOperation:

	cout << "please enter 1 for + , 2 for - , 3 for * , 4 for / , 5 to enter other numbers" << endl;
	cin >> Operation;
	//RE ENTER THE TWO NUMBERS//

	if (cin.fail())
	{

		cout << "please select validate operation" << endl;
		cin.clear();
		cin.ignore(10000, '\n');
		goto chooseOperation;

	}
	else if (Operation == 1)
	{

		Result = Num1 + Num2;

	}

	else if (Operation == 2)
	{
		Result = Num1 - Num2;
	}

	else if (Operation == 3)
	{

		Result = Num1 * Num2;

	}

	else if (Operation == 4)
	{
		if (Num2 == 0)
		{
			cout << "Can't divide over zero \n" << endl;

			goto chooseOperation;

		}

		else
		{
			Result = Num1 / Num2;
		}


	}

	else if (Operation == 5)
	{
		goto startingpoint;
	}

	//OUR OUTPUT//

	cout << "The Result is " << Result << endl;

	// MAKE OFFER FOR USER

	cout << " if you want to calculate other two numbers enter zero" << endl;
	cin >> Reply;
	if (Reply == 0)

	{
		goto startingpoint;


		}
	else {

		cout << "Thank's for using our software \n";
	}

	system("pause");
}