if ((fp=fopen("date.txt","r"))==NULL)是什么意思?
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![if ((fp=fopen(](/uploads/image/z/11195590-22-0.jpg?t=if+%28%28fp%3Dfopen%28%22date.txt%22%2C%22r%22%29%29%3D%3DNULL%29%E6%98%AF%E4%BB%80%E4%B9%88%E6%84%8F%E6%80%9D%3F)
if ((fp=fopen("date.txt","r"))==NULL)是什么意思?
if ((fp=fopen("date.txt","r"))==NULL)是什么意思?
if ((fp=fopen("date.txt","r"))==NULL)是什么意思?
fopen("date.txt","r")指以只读方式打开data.txt文件.fp是一个返回值,为指针.fp==NULL 是说操作失败.