?? fig06_13.pl
字號:
#!/usr/bin/perl
# Fig 6.13: fig06_13.pl
# Recursive factorial subroutine
# call function factorial for each of the numbers from
# 0 through 10 and display the results
foreach ( 0 .. 10 ) {
print "$_! = " . factorial( $_ ) . "\n";
}
# factorial recursively calculates the factorial of the
# argument it receives
sub factorial
{
my $number = shift; # get the argument
if ( $number <= 1 ) { # base case
return 1;
}
else { # recursive step
return $number * factorial( $number - 1 );
}
}
###########################################################################
# (C) Copyright 2001 by Deitel & Associates, Inc. and Prentice Hall. #
# All Rights Reserved. #
# #
# DISCLAIMER: The authors and publisher of this book have used their #
# best efforts in preparing the book. These efforts include the #
# development, research, and testing of the theories and programs #
# to determine their effectiveness. The authors and publisher make #
# no warranty of any kind, expressed or implied, with regard to these #
# programs or to the documentation contained in these books. The authors #
# and publisher shall not be liable in any event for incidental or #
# consequential damages in connection with, or arising out of, the #
# furnishing, performance, or use of these programs. #
###########################################################################
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