fopen command using "r" or "w"
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Why do we need to read and write files? Could u kindly explain the following lines?
fopen(A, 'r')
fopen(B, 'w')
回答（1 个）
Image Analyst
2019-3-24
0 个投票
You don't need to. If you don't need to import data from a file and don't need to output data to a file, then you don't need to use those functions. Only use them if you need to import or export data. If you use them, be sure you also use fclose().
2 个评论
Giovanni Ponce
2022-4-14
Could you explain what 'r' means when using it with fopen?
Walter Roberson
2022-4-14
'r' requests "read" access to the file. 'r' is the default if you do not specify the kind of access you need. "r" by itself requests the default "binary" file access; if you want to treat the file as a text file (possibly created on Windows) request "rt" (Read, Text)
If you open a file for read access, then it is permitted to fseek() inside the file. However it is not possible to write to the file; attempting to write will either give an error or else the writes will simply not happen.
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2022-4-14
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