using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Calculator programmed by: Jingwen Cao, 9A");

        Console.WriteLine("Option 1 - Basic Calculator");

        Console.WriteLine("Option 2 - BMI Calculator");

        Console.WriteLine("");

        int input;

        Console.WriteLine("Please select your calculator option. (Enter 1 or 2)");

        input = Convert.ToInt32(Console.ReadLine());

        if (input == 1)

        {

            Console.WriteLine("");

            Console.WriteLine("Basic Calculator");

            double a;

            double b;

            Console.WriteLine("Enter your first number:");

            a = Convert.ToDouble(Console.ReadLine());

            Console.WriteLine("Enter your second number:");

            b = Convert.ToDouble(Console.ReadLine());

            Console.WriteLine("");

            Console.WriteLine("SUM = " + (a+b));

            Console.WriteLine("DIFFERENCE = " + (a-b));

            Console.WriteLine("PRODUCT = " + (a*b));

            Console.WriteLine("QUOTIENT = " + (a/b));

        }

        else if(input == 2)

        {

            Console.WriteLine("");

            Console.WriteLine("BMI Calculator");

            double c;

            double d;

            double bmi;

            Console.WriteLine("Enter your weight in kilograms: ");

            c = Convert.ToDouble(Console.ReadLine());

            Console.WriteLine("Enter your height in meters: ");

            d = Convert.ToDouble(Console.ReadLine());

            Console.WriteLine("Your BMI is " + (c/(d*d)));

            bmi = (c/(d*d));

        }

    }

}