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The second and subsequent arguments in a call to the scanf
function usually are prefixed by the address-of operator, &, because
scanf's parameters are pointer parameters. Note, however, that
input_buffer is not prefixed by the address-of operator in the
following call to the scanf function:
scanf ("%s", input_buffer)
There is no address-of operator, because input_buffer is the name of
a character array, and the value returned by the name of a character array
is an address already.