C語言經典算法

/*實現字符串翻轉*/
char* reverse_str(char* str)
{
if(NULL == str) //字符串爲空直接返回
{
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) //交換兩個字符
{
temp = *begin;
*begin = *end;
*end = temp;
begin++;
end--;
}


return str; //返回結果
}