Sacar con scanf() todo el contenido del buffer del teclado.-

[leogtz]

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Return Value

On success, the function returns the number of items succesfully read. This count can match the expected number of readings or fewer, even zero, if a matching failure happens.
In the case of an input failure before any data could be successfully read, EOF is returned.

http://www.cplusplus.com/reference/clibrary/cstdio/scanf/