using System;

​

public class Program

{

    public static void Main()

    {

        //Initialize variables

        double temp;

        char unit;

        string line;

        double output;

        //Prompt user for temperature

        Console.WriteLine("Enter temperature: ");

        line = Console.ReadLine();

        while (!double.TryParse(line, out temp))

        {

            Console.Write("Invalid temperature. Please enter new temperature: ");

            line = Console.ReadLine();

        }

​

        //Prompt user for unit

        Console.WriteLine("Enter unit (C/F): ");

        line = Console.ReadLine();

        while (!char.TryParse(line, out unit))

        {

            Console.Write("Invalid unit. Please enter C or F: ");

            line = Console.ReadLine();

        }

​

        //Calculations

        if (unit == 'C')

        {

            output = (temp * (9.0 / 5.0)) + 32;

            Console.WriteLine($"{temp}°C is equal to {output}°F");

        }

        else

        {

            output = (temp - 32) * (5.0 / 9.0);

            Console.WriteLine($"{temp}°F is equal to {output}°C");

        }

    }

}