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C++ has two
basic classes to handle files, ifstream and
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ofstream. To use them, include the header file fstream.h.
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ifstream handles file input (reading from files).
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ofstream handles file output (writing to files). The way to
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declare an
instance of the ifstream or ofstream class is:
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ifstream a_file;
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//or
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ifstream
a_file("filename");
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