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Standard Streams Buffering

STDIO (Standard In/Out) streams are either: Fully buffered – the buffer is not flushed until the buffer is full. Line buffered – the buffer is flushed when a complete line is in the buffer or the buffer is full. Unbuffered – the buffer is flushed whenever there is data in the buffer. This is usually at the end of a call to a stdio function such as putc or printf. By default, stderr is not fully buffered and stdin and stdout are not fully buffered unless the system can determine that the stream is not connected to a tty device