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The C standard identifies specific strings to use for the {{mode}} on calls to {{fopen()}} \[[ISO/IEC 9899:1999|AA. C References#ISO/IEC 9899-1999]\]. To be strictly conforming and portable, one of the strings from the following table (adapted from the C standard) must be used:
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Strings to use for the mode on calls to {{fopen()}}
| Result |
|---|---|
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 or rb+ | open binary file for update (reading and writing) |
w+b or wb+ | truncate to zero length or create binary file for update |
a+b or ab+ | append; open or create binary file for update, writing at end-of-file |
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