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numround
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#!/usr/bin/perl -w
# round: A program that rounds off numbers it encounters.
#
# Copyright (C) 2002-2004 Suso Banderas
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#
# You may contact the author at <[email protected]>.
#######################
# VARIABLES AND SETUP #
#######################
use Getopt::Std;
use strict;
use vars qw/ %opts $verbose /;
use POSIX; # for rounding functions.
getopts('cfn:hdV', \%opts);
my ($file, @number_array, $verbose);
if ($opts{'h'}) {
&help();
exit(0);
}
if ($opts{'d'}) {
$verbose = 3;
print STDERR "Debug mode\n";
} elsif ($opts{'V'}) {
$verbose = 2;
print STDERR "Verbose mode\n";
} elsif ($opts{'q'}) {
$verbose = 0; # Nothing except the final answer
} else {
$verbose = 1; # Normal warnings and such.
}
# If the -n option is set, use the factor from that, otherwise use a factor
# of 1 for standard rounding.
my $factor = $opts{'n'} || 1;
################
# MAIN PROGRAM #
################
# For file args
if (@ARGV) {
foreach $file (@ARGV) {
print STDERR "Reading from file $file.\n" if ($verbose >= 2);
open (ARGFILE, "$file") &&
process_filehandle(\*ARGFILE, \@number_array) ||
$verbose && warn "Couldn't open file $file for reading: $!\n";
close (ARGFILE);
}
# For STDIN
} else {
print STDERR "Reading from STDIN.\n" if ($verbose >= 2);
process_filehandle(\*STDIN, \@number_array);
}
#process_numbers(\@number_array);
exit(0);
###############
# SUBROUTINES #
###############
sub help {
print <<"EOF";
---------------------------------------------------------
round : A program that rounds off numbers it encounters.
---------------------------------------------------------
Usage:
round [options] <file>
| round [options]
round [options]
Options:
-c Force the number to be rounded up. Ceiling.
-f Force the number to be rounded down. Floor.
-n <n> Round numbers to the nearest factor of <n>.
-d Debug. For developers only.
-h Help: You're looking at it.
-V Increase verbosity.
EOF
}
sub process_filehandle {
my $filehandle = shift;
my $number_array_ref = shift;
while (<$filehandle>) {
if (m/^\s*(\-?[0-9]*\.?[0-9]+)/) {
my $number = $1;
print STDERR "found number: $1\n" if ($verbose >= 3);
my $newnumber;
print STDERR "original number: $number\n" if ($verbose >= 2);
if ($opts{'c'}) {
$newnumber = ceiling_number($number);
} elsif ($opts{'f'}) {
$newnumber = floor_number($number);
} else {
$newnumber = round_number($factor, $number);
}
print "$newnumber\n";
}
}
return 1;
}
# The simple rounding function. In the next version, this function
# will be able to round to arbitrary factors of any number.
# The algorithm for this subroutine was inspired by the nearest subroutine
# in Geoffrey Rommel's Math::Round perl module. Thanks Geoffrey.
sub round_number {
my $factor = shift;
my $number = shift;
my $rounded_number;
$factor = abs($factor);
if ($number >= 0) {
$rounded_number = $factor * floor(($number + 0.5 * $factor) / $factor);
} else {
$rounded_number = $factor * ceil(($number - 0.5 * $factor) / $factor);
}
return $rounded_number;
}
sub ceiling_number {
my $number = shift;
my $ceiling_number = ceil($number);
return $ceiling_number;
}
sub floor_number {
my $number = shift;
my $floor_number = floor($number);
return $floor_number;
}
# Lay down some of that perl pod action.
=pod
=head1 NAME
round - A program that rounds off numbers it encounters.
=head1 SYNOPSIS
B<round> [-cdfhV] <FILE>
| B<round> [-cdfhV] (Input on STDIN from pipeline.)
B<round> [-cdfhV] (Input on STDIN. Use Ctrl-D to stop.)
=head1 DESCRIPTION
B<round> is a program that is part of the numeric utilities package. B<round>
will simply round decimal numbers to the nearest integer or to a factor of any
number using the -n option. You can also force it to round up (ceiling) or
round down(floor) using the -c and -f options.
=head1 OPTIONS
-c Force the number to be rounded up. Ceiling.
-f Force the number to be rounded down. Floor.
-n <n> Round numbers to the nearest factor of <n>.
-h Print out some helpful information about round.
-V Increase verbosity. This will print out numbers as it finds them.
-d Debug mode. For developers only.
=head1 BUGS
B<round> currently only rounds the first number on each line. Eventually this
will be changed as all the numeric utilities are developed.
B<round> will drop off the decimal places in decimal numbers. This may cause
some calculations to be in error, depending on how you are using the data.
=head1 SEE ALSO
average(1), bound(1), interval(1), normalize(1), numgrep(1), numprocess(1), numsum(1), random(1), range(1)
=head1 COPYRIGHT
round is part of the num-utils package, which is copyrighted by
Suso Banderas and released under the GPL license. Please read
the COPYING and LICENSE files that came with the num-utils package
Developers can read the GOALS file and contact me about providing
submissions or help for the project.
=head1 MORE INFO
More info on round can be found at:
=over 1
=item B<http://suso.suso.org/programs/num-utils/>
=back
=cut