经典，统计单词个数

int CountWord(char *p)

{

int i = 0;

int count = 0;

int word = 0;

char c ;

if(p == NULL)

return 0;

for(i = 0; (c=p[i]) != '\0'; i++)

{

if(c == ' ')

word =0;

else if(word == 0){   //这一句的逻辑，看到自己写的，很惭愧

word = 1;

count++;

}

}

return count;

}