I would also like to add up something related to this context. One can use *fprintf* and set the *1st argument to 2*, *which stands for stderr*, ie., the standard error stream. stderr is defined in *stdio.h* header. The classic thing about stderr is that, by default it does not buffers any contents and outputs everything immediately to your terminal/console. stdout and stderr are both associated to your terminal/console, but applications can use them differently.
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