将字符串中单词间多于一个的空格压缩为一个，再将单词反转，最后输出字符串

winter — Sat, 22 Oct 2011 08:38:00 GMT

如：This is a string转换为sihT si a gnirts

winter 2011-10-22 16:38 发表评论

String.c 实现

winter — Sat, 22 Oct 2011 08:09:00 GMT

1 /* strlen */
2 int strlen(const char *s)
3 {
4    const char *sx = s;
5    while (*sx++ != '\0')
6       ;/* do nothing */
7    return sx - s;
8 }

1 /* strcpy */
2 char* strcpy(char *dest, const char *src)
3 {
4    char *s = dest;
5    while ((*s++ = *src++) != '\0')
6       ;/* do nothing */
7    return dest;
8 }

1 /* strncpy */
2 char* strncpy(char *dest, const char *src, int n)
3 {
4    char *s = dest;
5    while (n--)
6    {
7       if ((*s++ = *src++) != '\0')
8          src++;
9       s++;
10    }
11    return dest;
12 }

1 /* memcpy 无法处理address overlapping问题 */
2 void* memcpy(void *dest, const void *src, size_t count)
3 {
4    char *d = dest;
5    const char *s = src;
6    while (count--)
7       *d++ = *s++;
8    return dest;
9 }

1 /* memmove
2  * Unlike memcpy, memmove copy with overlapping area */
3 void* memmove(void *dest, const void *src, size_t count)
4 {
5    char *d = dest;
6    const char *s = src;
7
8    if (dest <= src)
9    {
10       while (count--)
11          *d++ = *src++;
12    }
13    else
14    {
15       d += count;
16       s += count;
17       while (count--)
18          *--d = *--s;
19    }
20    return dest;
21 }

winter 2011-10-22 16:09 发表评论

C++博客-守望-文章分类-字符串

将字符串中单词间多于一个的空格压缩为一个，再将单词反转，最后输出字符串

String.c 实现