Conditional Constructs in Java — Question 40

import java.util.Scanner;

public class KboatTimeConversion
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.println("Conversion Table");
        System.out.println("================");
        System.out.println("1. Milliseconds to Seconds");
        System.out.println("2. Milliseconds to Minutes");
        System.out.println("3. Seconds to Milliseconds");
        System.out.println("4. Seconds to Minutes");
        System.out.println("5. Minutes to Milliseconds");
        System.out.println("6. Minutes to Seconds");
        System.out.print("Enter your choice: ");
        int choice = in.nextInt();
        double ip = 0, op = 0;
        switch (choice) {
            case 1:
            System.out.print("Enter Milliseconds: ");
            ip = in.nextDouble();
            op = ip / 1000;
            System.out.println("Seconds = " + op);
            break;
            
            case 2:
            System.out.print("Enter Milliseconds: ");
            ip = in.nextDouble();
            op = ip / 1000 / 60;
            System.out.println("Minutes = " + op);
            break;
            
            case 3:
            System.out.print("Enter Seconds: ");
            ip = in.nextDouble();
            op = ip * 1000;
            System.out.println("Milliseconds = " + op);
            break;
            
            case 4:
            System.out.print("Enter Seconds: ");
            ip = in.nextDouble();
            op = ip / 60;
            System.out.println("Minutes = " + op);
            break;
            
            case 5:
            System.out.print("Enter Minutes: ");
            ip = in.nextDouble();
            op = ip * 60 * 1000;
            System.out.println("Milliseconds = " + op);
            break;
            
            case 6:
            System.out.print("Enter Minutes: ");
            ip = in.nextDouble();
            op = ip * 60;
            System.out.println("Seconds = " + op);
            break;
            
            default:
            System.out.println("Incorrect choice");
        }
    }
}