public class Problem4 {

public static double celsiusToFahrenheit(double degree_C)
{
    double fahrenheitResult =  (9*(degree_C) / 5) + 32;
    return fahrenheitResult;
}

public static double fahrenheitToCelsius(double degree_F)
{
    double celsiusResult = 5*(degree_F - 32)/9;
    return celsiusResult;
}

public static void init(){
    Scanner scan = new Scanner(System.in);
    double result;
    char cont= 'y';
    char type;


    while (cont!='q' && cont!='Q')
    {
     System.out.println("Please enter the degree:");
     double degree = scan.nextDouble();

     System.out.println("Now enter the type of conversion (For Celsius, type 'C'. For Fahrenheit, type 'F')");
     type = scan.next().charAt(0);

     if(type!='c' && type!='C' && type!='f' && type!='F')
        {
             System.out.println("Error! You've entered an invalid conversion type!");
             System.out.println("Please enter a valid selection (Type C for celsius and F for fahrenheit");
             type = scan.next().charAt(0);
        }
     if (type == 'F' || type =='f')
        {
             result = fahrenheitToCelsius(degree);
             System.out.println("The conversion of "+ degree+"°F "+ "to Celsius is: " + result + "°C");

        }
     if (type == 'C' || type =='c')
        {
             result = celsiusToFahrenheit(degree);
             System.out.println("The conversion of "+ degree+"°C "+ "to Fahrenheit is: " + result + "°F");
        }


        System.out.println("Would you like to quit? Type 'q' to quit or type any other letter to continue:");
        cont = scan.next().charAt(0);
    }
    scan.close();
}

public static void main(String[] args)
{
    init();
}