求助 帮忙看下哪错了

#include "stdafx.h"
#include"stdio.h"
void main ()
{
     char string[81];
     int i,num=0,word=0;
     char c;
     gets(string);
     for(i=0;(c=string[i])!='\0';i++)
         if(c=='') word=0;
         else if(word=0)
         {
         word=1;
         num++;
         }
         printf("there are %d words in the line.\n,num");
}