number是30,a和b中的代码输出各是什么 (a)( ) if (number % 2 == 0) System.out.println(number + " is even."); System.out.println(number + " is odd."); (b)( ) if (number % 2 == 0) System.out.println(number + " is even."); else System.out.println(number + " is odd.");