using System;

​

public class Program

   //Creating a method that would calculate the heart rate 

{public static double THR(int age, double hr, int d) //this is to identify the variable for the calculation

    {

        double thr = 0.6 * ((220 - age) - hr) + hr;

        return Math.Round(hr, d);//returns the data to the program 

    }

​

    //Method for getting the input from the user

public static void data(ref int age, ref double hr) //This shows the changes that are saved in the program

    {

        //Getting the age

        do

        {

            try

            {

                Console.WriteLine("Enter in the age: ");

                age = Convert.ToInt32(Console.ReadLine()); //Taking in the age 

            }

            catch

            {

                Console.WriteLine("ERROR! Please Enter In A Number!");

                age = -1;

            }

        }while (age <= 0);

        //Getting the Resting Heart rate 

        do

        {

            try

            {

                Console.WriteLine("Enter in the Resting Heart Rate: ");

                hr = Convert.ToInt32(Console.ReadLine()); //Taking in the age 

            }

            catch

            {

                Console.WriteLine("ERROR! Please Enter In A Number!");

                 hr = -1;

            }

        }while (hr <0);

}

public static void Main()

{

            Console.WriteLine("THR Calculator");

            Console.WriteLine(new String('-', 50));

            int age = 0;

            double hr = 0;

            //This is saves the input's that the user gave for age and rating heart rate 

            data(ref age, ref hr);

            double total = THR(age, hr, 2); //This calculates the resting heart rate

            Console.WriteLine(new String('-', 50));

            Console.WriteLine("Your THR is:" + total);

    }

}