a grand renaming so that the most significant portion of the name comes first

perl-practice/cli/ex02/input.pl

@@ -0,0 +1,22 @@
+#!/usr/bin/env perl
+use strict;
+use warnings;
+
+
+my @inlines = ();
+my $i = 0;
+
+for ($i = 0; $i < 3; $i++) {
+    print "input please: ";
+    my $inline = <STDIN>;
+    $inline =~ s/\s*$//;
+    $inlines[$i] = $inline;
+}
+
+
+print "You said:\n";
+print join("|", $inlines[0], $inlines[1], $inlines[2] . "\n");
+
+
+1;
+__END__

perl-practice/cli/ex02/input_argv.pl

@@ -0,0 +1,11 @@
+#!/usr/bin/env perl
+use strict;
+use warnings;
+
+foreach my $inline (@ARGV) {
+    print $inline . "\n";
+}
+
+
+1;
+__END__

perl-practice/cli/ex02/input_fromfile.pl

@@ -0,0 +1,33 @@
+#!/usr/bin/env perl
+use strict;
+use warnings;
+
+use IO::File;
+use File::Basename;
+
+
+my $script = basename($0);
+my $USAGE = <<USAGE
+Usage: $script <infile>
+USAGE
+;
+
+if (!defined $ARGV[0]) {
+    die $USAGE;
+}
+
+my $infile = $ARGV[0];
+open(DAT, $infile) or die "$infile: $!";
+my @cleaned = ();
+foreach my $line (<DAT>) {
+    $line =~ s/\s*$//;
+    $cleaned[++$#cleaned] = $line;
+}
+
+print join("|", @cleaned) . "\n";
+
+close(DAT);
+
+
+1;
+__END__

perl-practice/cli/ex02/quadratic.pl

@@ -0,0 +1,53 @@
+#!/usr/bin/env perl
+use strict;
+use warnings;
+
+use Math::Complex;
+use File::Basename;
+
+
+my $prog = basename($0);
+my $USAGE = <<USAGE
+Usage: $prog <a> <b> <c>
+USAGE
+;
+
+
+sub quad {
+    my ($a, $b, $c) = @_;
+    my $positive = (
+        ($b * -1) - sqrt(($b ** 2) - (4 * ($a * $c))) / (2 * $a)
+    );
+    my $negative = (
+        ($b * -1) + sqrt(($b ** 2) - (4 * ($a * $c))) / (2 * $a)
+    );
+
+    return ($positive, $negative);
+}
+
+foreach my $arg (@ARGV) {
+    if (($arg eq "-h") || ($arg eq "--help")) {
+        die $USAGE;
+    }
+}
+
+my ($a, $b, $c) = @ARGV;
+if (!defined $a) {
+    print '$a = ';
+    $a = <STDIN>;
+}
+if (!defined $b) {
+    print '$b = ';
+    $b = <STDIN>;
+}
+if (!defined $c) {
+    print '$c = ';
+    $c = <STDIN>;
+}
+
+my @result = quad($a, $b, $c);
+printf("%s, %s\n", $result[0], $result[1]);
+
+
+1;
+__END__