将句子中的单词位置倒置,而不改变单词内部结构.

编写一个C函数,将”I am from shanghai ”倒置为”shanghai from am I”,及将句子中的单词位置倒置,而不改变单词内部结构.

#include <stdio.h>

#include <string.h>

void daozhi(char *s)

{
char temp;
char *end = s;//统计每个单词的开头和结尾
char *start = s;
char *p = s;

while(*p++ != '\0')
{
if (*p == ' ' || *p == '\0')//表示指针前面是个单词
{
end = p - 1;//表示前面单词的末尾

while (end > start)//将每个单词倒叙比如from 变为 morf
{
temp = *start;
*start = *end;
*end = temp;
start++;
end --;
}
start = end = p + 1 ;//头和尾指针指向下一个单词
}
}

start = s;//将i ma morf iahgnahs 倒叙输出
end = p - 2;
while(end > start)
{
temp = *start;
*start = *end;
*end = temp;
start++;
end--;

}

}

int main()

{
char s[] ={"I am from shanghai"};
printf("%s\n",s);
daozhi(s);
printf("%s\n",s);

    return 0;

}