using System;

​

public class Program

{

    //INPUT - GETDATA

    //keyword "out" is used to tell C# to save the changes made to the parameters

    public static void GetData (ref double h,ref double w){

​

        //INPUT - user's height and weight

        do{

            try{

                Console.WriteLine("Height (in):");

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

                //takes in height as a decimal

            }

            catch{  //catch formatting errors

                Console.WriteLine("Please enter a positive number!");

                h = -1;

            }

        }while (h<0); //ensures height is postive

​

        do{

            Console.WriteLine("Weight (lbs):");

            w = Convert.ToDouble(Console.ReadLine());  //takes in weight as a decimal

        }while (w<0);  //ensures weight is postive

    }

​

    public static void Main()  //Main Method- Starting Point for our Project!

    {

        Console.WriteLine("Welcome to BMI Calculator");

​

        double h=0;

        double w=0;  //defines the user's height and weight

        //INPUT - retrieves the user's height and weight

        GetData(ref h,ref w);  //ref = reference to memory

​

        //PROCESSING

        //calculate the user's BMI value

        double result = BMI (h,w,0 ); //calculates the user's bmi value  

​

        //OUTPUT

        Display(result);  //display the user's bmi along with description for the bmi

​

    }

​

    /**

    Will display the user's bmi along with a message

    */

    public static void Display (double bmi){

​

        Console.WriteLine("BMI: " +bmi);

        if (bmi<20)  //less than 20 

            Console.WriteLine("BMI is too LOW! Eat KFC!");

        else if (bmi <=25)  //20-25

            Console.WriteLine("BMI is just RIGHT! Keep going!!");

        else  //bmi greater 25

            Console.WriteLine("BMI is too HIGH! Eat more VEGGIES!");

    }

​

​

    //NOTE: Syntax for a method

    //public static <return type> methodName (data in)

    //Data IN: height, weight and number of decimal places to round

    //Data OUT: user's bmi

    public static double BMI (double height, double weight,int d){

        double bm = 0;  //bmi variable

​

        bm = 703*weight/Math.Pow(height,2);  //calculation

​

        return Math.Round(bm,d);     //returns bmi back to calling program

    }

}