class switch
{
public static void main(String[] args) {

  int a = 10, b = 20, ch;
  System.out.print("Enter User Choice..!\n");

  Scanner r = new Scanner(System.in);
  ch = r.nextInt();

  switch (ch) 
  {
    case 1:
      System.out.print("Sum + (a + b));
      break;
    case 2:
      System.out.print("Sub + (a - b));
      break;
    case 3:
      System.out.print("Multi + (a * b));
      break;
    case 4:
      System.out.print("Div + (a / b));
      break;
    default:
      System.out.print("Invalid Choice..");
  }
}