this is a gaga return into gaga a is this

例如：(唉～～，实践知识到用时，方恨少啊。。。回家老老实实写了个半小时才写完的。。。可能边界情况没有考虑充分。。。)

int _tmain(int argc, _TCHAR* argv[])
{
char *str = (char*)malloc(15);
char *str_words[MAXLEN], *p_str = str;
strcpy(str,"this is a dog");
int word_num = readwords(str, str_words);
int tmp_cnt =0, char_num = 0;
for (; tmp_cnt < word_num; tmp_cnt++ )

{
char_num = strlen(str_words[word_num-tmp_cnt-1]);
memcpy(str, str_words[word_num-tmp_cnt-1],char_num);
str +=char_num;
*str++ = ' ';
}
*str = '\0';
cout<<p_str<<endl;
return 0;
}

/* str is the words array, str_words is the output arrays */
int readwords(char * str, char *str_words[])
{
int words_cnt = 0;
int word_len = 0;
char *p = NULL;
char word[MAXLEN];

/*later for the conner case */
if ( NULL == str )
{
return 0;
}
word_len = getword(word,str);

p = (char*)malloc(word_len);
strcpy(p, word);
str_words[words_cnt++] = p;

str += (word_len - 1);
while( *str != '\0')
{
if((*str == ' ') || (*str == '\t'))
{
word_len = getword(word,++str);

p = (char*)malloc(word_len);
strcpy(p, word);
str_words[words_cnt++] = p;

str += (word_len - 1);
}
else
{
str++;
}
}
return words_cnt;
}

int getword(char *word, char *str)
{
int word_len = 0;

if(NULL == str)
{
return 0;
}

while((*str != ' ')&&(*str != '\0'))
{
word_len++;
*word++ = *str++;
}

if((*str == ' ') || ( *str == '\0'))
{
*word = '\0';
word_len++;
}
return word_len;

}