将一个给定的字符串倒过来输出

344. Reverse String

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Write a function that takes a string as input and returns the string reversed.

Example:
Given s = "hello", return "olleh".

将一个给定的字符串倒过来输出。

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 1 char* reverseString(char* s) {
 2
 3     int left,right;
 4     char *tmp;
 5     left = 0;
 6     right = strlen(s)-1;
 7
 8     //两边同时移动指针赋值
 9     while(left < right ){
10         tmp = s[left];
11         s[left++] = s[right];
12         s[right--] = tmp;
13     }
14
15      return s;
16 }

上面的方法未多分配多余的内存空间，输出和输入的内存一样。