字符串反转

I am a students->students a am I
做事要动脑筋，要因情况而定。2016-07-23该
基本思路：
(1)单词单个反转
(2）整体反转

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
void reverse(char *str,int begin,int end)
{//实现单词反转
    char temp;
    while (begin < end)
    {
        temp = str[begin];
        str[begin++] = str[end];
        str[end--] = temp;
    }
}
void reverseString(char *str)
{
    int length = strlen(str);
    int begin = -1,end = -1;
    int i = 0;
    for (i = 0;i < length;i++)
    {
        if (begin == -1 && str[i] == ' ')//处理多个空格
            continue;
        if (begin == -1)//确定起始位置
        {
            begin = i;
            continue;
        }
        if (str[i] == ' ')
        {
            end = i-1;

        }
        else if (i == length-1)
        {
            end = i;
        }
        else
        {
            continue;
        }
        reverse(str,begin,end);
        begin =-1;
        end = -1;
    }
    reverse(str,0,length-1);
}
int main()
{
    char str[] = "I am a students.";
    reverseString(str);
    printf("%s\n",str);
    return 0;
}