Miniräknare :D

#include <iostream>
#include <string>
#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()
{
    cout << "Welcome to the Ultimate Calculator of Lord Nur.\n";
    double number1;
    double number2;
    int choice;
    cout << "What do you want to do?\n 1 = Adding.\n 2 = Subtracting.\n 3 = Multiplying.\n 4 = Dividing.\n" << endl;
    cout << "Choice: ";
    cin >> choice;
    if (choice==1)
    {
        // Addition
        cout << "You are adding, enter the first number you would like to add. \nNumber 1:";
        cin >> number1;
        cout << "Enter the second number. \nNumber 2: ";
        cin >> number2;
        cout << "The result is: " << addition(number1, number2) << endl;
    }
    else
    {
        if (choice == 2)
        {
            // Subtraction
            cout << "You are subtracting, enter the first number you would like to subtract. \nNumber 1:";
            cin >> number1;
            cout << "Enter the second number. \nNumber 2: ";
            cin >> number2;
            cout << "The result is: " << subtraction(number1, number2) << endl;
        }
    else
        {
            if (choice==3)
            {
            // Multiplication
            cout << "You are multiplying, enter the first number you would like to multiply. \nNumber 1:";
            cin >> number1;
            cout << "Enter the second number. \nNumber 2: ";
            cin >> number2;
            cout << "The result is: " << multiplication(number1, number2) << endl;
        }
            else
            {
                {
                    // Division
                    cout << "You are dividing, enter the first number you would like to divide. \nNumber 1:";
                    cin >> number1;
                    cout << "Enter the second number. \nNumber 2:";
                    cin >> number2;
                    cout << "The result is: " << division(number1, number2) << endl;
                }
            }
        }
    }
    int choice2;
    cout << "Do you want to keep calculating or quit?\n1 = Keep calculating.\n2 = Quit.\n" << endl;
    cout << "Choice: ";
    cin >> choice2;
    if (choice2 == 1)
    {
        cout << "What do you want to do?\n 1 = Adding.\n 2 = Subtracting.\n 3 = Multiplying.\n 4 = Dividing.\n";
            cin >> choice;
    }
    else
    {
        return 0;
    }
}