数组倒置问题
数组中有四个字符，a b c d怎么将他们倒置，变成dcba啊

------解决方案--------------------
char[] a = { 'a', 'b', 'c', 'd','e' };
char b;
int len = a.Length;
for (int i = 0; i < len / 2; i++)
{
b = a[i];
a[i] = a[len - i - 1];
a[len - i - 1] = b;
}