ANSIC 之 stdio.h 之 fopen[@more@]
1，原型：FILE* fopen(const char* filename, const char* mode)
2，filename 为文件名
3，mode 字符串：
- r open text file for reading
- w truncate to zero length or create text file for writing
- a append; open or create text file for writing at end-of-file
- rb open binary file for reading
- wb truncate to zero length or create binary file for writing
- ab append; open or create binary file for writing at end-of-file
- r+ open text file for update (reading and writing)
- w+ truncate to zero length or create text file for update
- a+ append; open or create text file for update, writing at end-of-file
- r+b open binary file for update (reading and writing)
- rb+ open binary file for update (reading and writing)
- w+b truncate to zero length or create binary file for update
- wb+ truncate to zero length or create binary file for update
- a+b append; open or create binary file for update, writing at end-of-file
- ab+ append; open or create binary file for update, writing at end-of-file
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