Common Methods for opening files in C ++

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IOS: APP: open a file in append Mode
IOS: ate: After the file is opened, it is located at the end of the file. IOS: app contains this attribute.
IOS: Binary: open a file in binary mode. The default mode is text. For the differences between the two methods, see the previous article.
IOS: In: open the file as input
IOS: Out: open an output file
IOS: nocreate: The file is not created, so opening fails if the file does not exist.
IOS: noreplace: Does not overwrite the file. Therefore, if the file fails to be opened
IOS: trunc: if the file exists, set the file length to 0.
You can use "or" to connect the preceding attributes, for example, IOS: Out | IOs: binary.
IOS: Beg: Start of the file
IOS: cur: current file location
IOS: end: End of the file
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