erste-codebase/files/calculator.h

#include <iostream>
#ifndef calculator_h
#define calculator_h
using namespace std;

void Addition()
{
	cout << endl << "Please enter variable a." << endl << endl;
	float num1;
	cin >> num1;
	cout << endl << "Please enter variable b." << endl << endl;
	float num2;
	cin >> num2;
	float sumPlus = num1 + num2;
	cout << endl << num1 << "+" << num2 << "=" << sumPlus << endl;
}

// for addition +

void Subtraction()
{
	cout << endl << "Please enter variable a." << endl << endl;
	float num1;
	cin >> num1;
	cout << endl << "Please enter variable b." << endl << endl;
	float num2;
	cin >> num2;
	float sumMin = num1 - num2;
	cout << endl << num1 << "-" << num2 << "=" << sumMin << endl;
}

// for subtraction -

void Multiply()
{
	cout << endl << "Please enter variable a." << endl << endl;
	float num1;
	cin >> num1;
	cout << endl << "Please enter variable b." << endl << endl;
	float num2;
	cin >> num2;
	float sumMulti = num1 * num2;
	cout << endl << num1 << "*" << num2 << "=" << sumMulti << endl;
}

// for multiplication *

void Divide()
{
	cout << endl << "Please enter variable a." << endl << endl;
	float num1;
	cin >> num1;
	cout << endl << "Please enter variable b." << endl << endl;
	float num2;
	cin >> num2;
	float sumDiv = num1 / num2;
	cout << endl << num1 << ":" << num2 << "=" << sumDiv << endl;
}

// for dividation /

void Modulus()
{
	cout << endl << "Please enter variable a." << endl << endl;
	int num1;
	cin >> num1;
	cout << endl<< "Please enter variable b." << endl << endl;
	int num2;
	cin >> num2;
	int sumMod = num1 % num2;
	cout << endl << num1 << "%" << num2 << "=" << sumMod << endl;
}

// for Modulis operator %

int calculator()

{
	while (true)
	{
		cout << endl << "Please enter what you want to calculate." << endl
			 << endl
			 << "Quit / Q --> stop" << endl
			 << "+ / 1 --> +" << endl
			 << "- / 2 --> -" << endl
			 << "* / 3 --> *" << endl
			 << ": / 4 --> /" << endl
			 << "% / 5 --> %" << endl
			 << endl;

		// sends input table to user

		{
			char input;
			cin >> input;

			// user input for operations

			switch (input)
			{
			case 'q':
				cout << endl << "stopping calculator" << endl;
				return 0;

			case 'Q':
				cout << endl << "stopping calculator" << endl;
				return 0;

			case 'quit':
				cout << endl << "stopping calculator" << endl;
				return 0;

			case 'Quit':
				cout << endl << "stopping calculator" << endl;
				return 0;

			case '+':
				Addition();
				break;

			case '1':
				Addition();
				break;

			case '-':
				Subtraction();
				break;

			case '2':
				Subtraction();
				break;

			case '*':
				Multiply();
				break;

			case '3':
				Multiply();
				break;

			case '/':
				Divide();
				break;

			case '4':
				Divide();
				break;

			case ':':
				Divide();
				break;

			case '%':
				Modulus();
				break;

			case '5':
				Modulus();
				break;

				// for integrating operators to calculator

			default:
				cout << "You can't caltulate with that, can you?" << endl
					 << endl;
			}
		}
	}
}
// for illigal input
#endif