#include <stdio.h>
#include <string.h>
int main()
{
// char *p = "I am from shanghai";
// char str[] = "I am from shanghai";
char str[] = "you are from shanghai";
// 将整个字符串逆序
char *p1 = str;
char *p2 = str + strlen(str) - 1;
char *p3 = NULL; // 用于将单词逆序
char tmp;
while (p1 < p2)
{
tmp = *p1;
*(p1++) = *p2;
*(p2--) = tmp;
}
puts(str);
// 再将每一个单词进行逆序，单词通过空格去找
p1 = str;
p2 = str;
while(*p2) // p2找到字符串结束为止
{
if (*p2 == ' ') // 找到一个单词，要将前面的单词进行逆序
{
p3 = p2 - 1;
while (p1 < p3)
{
tmp = *p1;
*(p1++) = *p3;
*(p3--) = tmp;
}
p1 = p2 + 1;
}
p2++;
}
p3 = p2 - 1;
while (p1 < p3)
{
tmp = *p1;
*(p1++) = *p3;
*(p3--) = tmp;
}
puts(str);
return 0;
}
