#include "stdafx.h"
#include <iostream>
#include <cstdlib>
using namespace std;


double Addition(double Num1, double Num2)
{
	return Num1 + Num2;
}

double Subtraction(double Num1, double Num2)
{
	return Num1 - Num2;
}

double Multiplication(double Num1, double Num2)
{
	return Num1 * Num2;
}

double Division(double Num1, double Num2)
{
	return Num1 / Num2;
}

int main()
{
	double Number1;
	double Number2;
	int operation;
	char systempause;

	cout << "\n Welcome to this easy to use text-based calculator. \n" << endl;
	cout << "\n What would you like to do? \n" << endl;
	cout << "\n Press 1 for Addition. \n Press 2 for Subtraction. \n Press 3 for Multiplication. \n Press 4 for Division. \n" << endl;
	cin >> operation;

	if (operation==1)
	{
		cout << "\n You have chosen addition. Please input the first number. \n" << endl;
		cin >> Number1;
		cout << "\n The first number you have selected is " << Number1 << ". Please input the second number. \n" << endl;
		cin >> Number2;
		cout << "\n The answer is " << Addition(Number1, Number2) << endl;
	}
	else
	{
		if (operation==2)
		{
			cout << "\n You have chosen subtraction. Please input the first number. \n" << endl;
			cin >> Number1;
			cout << "\n The first number you have selected is " << Number1 << ". Please input the second number. \n" << endl;
			cin >> Number2;
			cout << "\n The answer is " << Subtraction(Number1, Number2) << endl;
		}
		else
		{
			if (operation==3)
			{
				cout << "\n You have chosen multiplication. Please input the first number. \n" << endl;
				cin >> Number1;
				cout << "\n The first number you have selected is " << Number1 << ". Please input the second number. \n" << endl;
				cin >> Number2;
				cout << "\n The answer is " << Multiplication(Number1, Number2) << endl;
			}
			else
			{
				if (operation==4)
				{
					cout << "\n You have chosen division. Please input the first number. \n" << endl;
					cin >> Number1;
					cout << "\n The first number you have selected is " << Number1 << ". Please input the second number. \n" << endl;
					cin >> Number2;
					cout << "\n The answer is " << Division(Number1, Number2) << endl;
				}
				else
				{
					cout << "\n The choice you have selected is invalid. Please re-open the program. \n" << endl;
				}
			}
		}
	}


	cout << "\n Thank you for using the program. \n";
	cin >> systempause;
	return 0;
}