Which C++ stream manipulator forces the output buffer to be flushed?

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C. Both endl and flush

Answer: (C) Both endl and flush

Both endl and flush can cause the output buffer to be flushed.

endl inserts a newline and then flushes the stream.

flush flushes the output stream without necessarily inserting a newline.

For example:

cout << "Hello" << flush;

forces the output to be sent from the buffer to the associated output device.

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