第2部分
先检验一下自己的水平吗?  Let's Go! 自我测试
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  | void reverse(char s[])                  /* (char *s) */
{
    int c, i, j;
    for (i = 0, j = strlen(s)-1; i < j; i++, j--) {
        c = s[i];  s[i] = s[j];  s[j] = c;
    }
} | 
void reverse(char s[])                  /* (char *s) */
{
    int c, i, j;
    for (i = 0, j = strlen(s)-1; i < j; i++, j--) {
        c = s[i];  s[i] = s[j];  s[j] = c;
    }
}