有以下程序： void fun(int a*a，int i，int i) {int t； if(i＜j)； {t=a[i]；a[i]＝a[j]；a[j]＝t； fun(a，++i，--j)； } } main() {inta[]＝{1，2，3，4，5，6}，i； fun(a，0，5)； for(i＝0；i(6；i++) cout＜(a[i]； } 执行后输出结果是()。

A．6 5 4 3 2 1

B．4 3 2 1 5 6

C．4 5 6 1 2 3

D．1 2 3 4 5 6

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