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What is the difference between opening a dataset for input, output, appending?

April 26, 2017appending dataset difference input opening output

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What is the difference between opening a dataset for input, output, appending?

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FOR OUTPUT Opens the file for writing if exists it is overwritten if not then it is created. FOR INPUT Opens an existing file for reading. FOR APPENDING Opens the file for writing at the end of the file .If it does not exist, it is created, if opened, you return to the end.