if ((fp=fopen("date.txt","r"))==NULL)是什么意思?
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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.
if ((fp=fopen("date.txt","r"))==NULL)是什么意思?
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