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man出来的文档,有些单词带了下划线,那是什么用的。。
FOPEN(P) FOPEN(P)
NAME
fopen - open a stream
SYNOPSIS
#include <stdio.h>
FILE *fopen(const char *restrict filename, const char *restrict mode);
DESCRIPTION
The fopen() function shall open the file whose pathname is the string pointed to by filename, and associates a stream with it.
The mode argument points to a string. If the string is one of the following, the file shall be opened in the indicated mode. Otherwise, the behavior is undefined.
r or rb
Open file for reading.
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