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一.題目
Given the code fragment:
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| public class OCA_5 { | |
| public static void main(String[] args) { | |
| int x = 5; | |
| while (isAvailable(x)) { | |
| System.out.print(x); | |
| } | |
| } | |
| public static boolean isAvailable(int x) { | |
| return x-- > 0 ? true:false; | |
| } | |
| } |
Which modification enables the code to print 54321?
A. Replace line 6 with System.out. print (--x) ;
B. At line 7, insert x --;
C. Replace line 6 with --x; and, at line 7, insert System.out.print (x);
D. Replace line 12 with return (x > 0) ? false: true;
二.答案
B
三.解析
--x是這段敘述開始就減。
x--是這段敘述結束後再減。
isAvailable( )方法的 x--不會影響到 main方法裡面 x變數的值
(A)43210，印出來前，都會先減 1，所以是從4開始到0。
(B)54321，先印出5，然後印到1
(C)43210，印出來前，都會先減 1，所以是從4開始到0。
(D)不會印東西
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