Originariamente inviato da cristianc
una variabile nominata a piacere che e' stata dichiarata precedentemente all'inizio del main.
Il tipo ovviamente e' intero.
Controlla il valore restituito dalla scanf:
RETURN VALUES
These functions return the number of input items assigned, which can be
fewer than provided for, or even zero, in the event of a matching fail-
ure. Zero indicates that, while there was input available, no conver-
sions were assigned; typically this is due to an invalid input character,
such as an alphabetic character for a `%d' conversion. The value EOF is
returned if an input failure occurs before any conversion such as an end-
of-file occurs. If an error or end-of-file occurs after conversion has
begun, the number of conversions which were successfully completed is
returned.