for(i=0;(c=str[i])!='\0';i++)
        if(c==' ')word=0;
        else if(word==0)
        {
            word=1;
            num++;
        }
        printf("There are %d words in the line.\n",num);

谁来帮我吧FOR改成while

i=0;
while((c=str[i])!='\0')
{      
        if(c==' ')word=0;
        else if(word==0)
        {
            word=1;
            num++;
        }
       i++；
}
printf("There are %d words in the line.\n",num);
这样行不？