Source Code : Acceptable fopen() Modes

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Acceptable fopen() Modes

 
r        Open the file for reading.
 
r+       Open the file for reading and writing.
 
w        Open the file for writing, overwriting existing files, and creating the file if it does not exist.
 
w+       Open the file for reading and writing, overwriting existing files, and creating the file if it does not exist.
 
a        Open the file for writing, creating the file if it does not exist, and appending to the file if it does.
 
a+       Open the file for reading and writing, creating the file if it does not exist, and appending to the file if it does.
 
b        Open the file in binary reading/writing mode (applicable only on Windows systems; however, recommended in all scripts).
  
  

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