CRC32 Calculator - Pipe edition

The CRC32 Calculator - Pipe edition application was designed to be a small command-line program that calculates the crc32 of its standard input and then writes it out (to its standard output) in hex format.
Usage:
{command} | crcp
crcp < {filename>}
Just typing crcp leads to error. Note that is doesnt take filename as a parameter! You MUST use input redirection "