请问关于统计单词数的代码有哪些问题？

Question

#include
int main ()
{
char str[81];
int i=0,num=0,word=0;
char c;
while((str[i++]=getchar())!='n');
str[i]='\0';
for(i=0;(c=str[i])!='\0';i++)
if (c=='') //编译时此处出错10 [Error] empty character constant
word=0;
else if(word==0)
{
word=1;
num++;
}
printf("%d\n",num);
return 0;
}

Answer 1

(1) while((str[i++]=getchar())!='\n'); //换行是\n
(2) if (c==' ') //引号中打个空格