import java.util.*;
import java.lang.Math;

public class TempConverter
{  
   //Constants
   public static final String FCONVERT = "\nConverted to Farenheit: ";
   public static final String KCONVERT = "\nConverted to Kelvin: ";
   
   public static void main(String[] args)
   {
        String userInputStr;     //temporary String variable to hold String input from user
        char endReply;    // yes or no so y/n is fitting
        int tempType;      // 1 or 2 to describe the type of conversion 
        double celcius, farenheit, kelvin;       //temperature will have decimals
        boolean end;            //boolean (true/false) to end while loop
        Scanner inputStream = new Scanner(System.in);
        
        // initialize variables
        celcius = 0.;
        farenheit = 0.;
        kelvin = 0.;
        end = true;

        System.out.print("This program converts degress in Celcius to Farenheit or Kelvin \n");
        
        while(end)
        {
            // get degress in celcius from user
            System.out.print("\nTemperature in Celcius: ");
            userInputStr  = inputStream.nextLine();
            celcius = Double.parseDouble(userInputStr);
            System.out.print(celcius);

            // input from user, what do they want to conver to
            while(true)
            {
                System.out.print("\nConvert to (1)Farenheit or (2)Kelvin: ");
                userInputStr = inputStream.nextLine();
                tempType = Integer.parseInt(userInputStr);
                if ((tempType == 1) || (tempType == 2))
                {
                    break;
                }
                else
                {
                    System.out.print(tempType);
                    System.out.println("\nPlease input either 1 or 2");
                }
            }
            System.out.print(tempType);

            //conversion
            if (tempType == 1) //convert to farenheit
            {
                farenheit = (celcius*1.8)+32;   //multiple by 1.8 and then add 32, result is a double
                System.out.print(FCONVERT);
                System.out.print(farenheit);
            }
            else   //convert to kelvin
            {
                kelvin = celcius + 273.15;    //add 273.15, result is a double
                System.out.print(KCONVERT);
                System.out.print(kelvin);
            }

            // input from user, ask if they want to do another conversion 
            while(true)
            {
                System.out.print("\nWould you like to do another conversion? (y/n): ");
                userInputStr  = inputStream.nextLine();
                endReply = userInputStr.charAt(0);
                if ((endReply == 'y') || (endReply == 'Y')) //do another conversion
                {
                    System.out.print(endReply);
                    break;
                }
                else if ((endReply == 'n') || (endReply == 'N')) //stop here
                {
                    System.out.print(endReply);
                    end = false;
                    break;
                }
                else          //invalid input, repeat prompt
                {
                    System.out.print(endReply);
                    System.out.print("\nPlease input y or n\n");
                }
            }
        }
   }  
}
TempConverter.main(null);