C语言经典算法

/*实现字符串翻转*/
char* reverse_str(char* str)
{
if(NULL == str) //字符串为空直接返回
{
return str;
}
char *begin;
char *end;
begin = end = str;


while(*end != '\0') //end指向字符串的末尾
{
end++;
}
--end;


char temp;
while(begin < end) //交换两个字符
{
temp = *begin;
*begin = *end;
*end = temp;
begin++;
end--;
}


return str; //返回结果
}