#include <stdio.h>
FILE *fopen(const char *filename, const char *mode);
"r" or "rb" : 只读
"w" or "wb" : 打开并写,
"r+" or "rb+" or "r+b" : 打开并 update
"w+" or "wb+" or "w+b" : 打开并update,删去原内容
"a+" or "ab+" or "a+b" : 打开并update,在文件末尾追加
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