import java.util.Scanner;
public class Main {
    public static void main(String[] args)
    {
        Scanner sc = new Scanner(System.in);
        System.out.println("-------Welcome to the Radius calculator-------");

        String input = new String (" ");
        while(input.equals("END")==false) {

            for (int i = 1; i < 5; i  )
                for (int e = 5; e > 0; e--)
                {
                    {
                        System.out.println("-----------------------------");
                        System.out.println("Hey you can use this calcultor "   e   " more time(s) till yoh have to purchase our full version only 3.99");
                    }
                    System.out.println("Please enter your Radius if not just type in END at any stage during the program");
                    Double num =sc.nextDouble();

                    System.out.println("Enter 1 if you would like to get the area");
                    System.out.println("Enter 2 if you would like to get the circumfrence");

                    int num1 = sc.nextInt();

                    if (num1 == 1) {
                        System.out.println("The area of the circle with the radius "   num   " is :"   (Math.PI) * (num * num));
                    } else if (num1 == 2) {
                        System.out.println("The circumfrence of the circle with the radius "   num   " is :"   (2) * (Math.PI) * (num));

                    } else {
                        System.out.println("No answer for you boss");
                        System.out.println("Try again!");
                    }
                    System.out.println("You have used this calculator effiently "   i   " time(s)");
                    System.out.println("-----------------------------");


                }
        }

    }
}

Heres my code it works but when i type in END an ERROR comes up.(https://i.stack.imgur.com/ZZxEW.png)](https://i.stack.imgur.com/ZZxEW.png)

If theres any othere tips to make my code for effecient would be much appriciated too.

CodePudding user response：

You forgot to ask for the end input during the loops.
The best way to ask for an input of different types is to use BufferedReader Class

BufferedReader reader =new BufferedReader(newInputStreamReader(System.in));
String input = null;
try {
    input = reader.readLine();
} catch (IOException ex) {
    throw new RuntimeException(ex);
}
if (input.equals("END")) {
    break;
}

After that you can use :
Integer.parseInt(input); to cast from String to Integer
And don't forget to clean and simplify your code.