Guess the output of a java program

  public static void main(String[] args){
     int ch=1,a=10,b=0;
     switch(ch){
         case 1 : System.out.println(a+b);
          case 2 : System.out.println(a-b);
           case 3 : System.out.println(a/b);
           default :System.out.println("Invalid");
     }
    }