Create call_by_reference.pl

call_by_reference/perl/call_by_reference.pl

@@ -0,0 +1,19 @@
+#!/usr/bin/perl -w
+
+my $num1 = 100;
+my $num2 = 5;
+
+sub swap{
+  $temp = $_[0];
+  $_[0] = $_[1];
+  $_[1] = $temp;
+  return;
+}
+
+print "Value of num1 BEFORE swap $num1\n";
+print "Value of num2 BEFORE swap $num2\n\n";
+
+swap($num1, $num2);
+
+print "Value of num1 AFTER swap $num1\n";
+print "Value of num2 AFTER swap $num2";

is_palindrome/perl/is_palindrome.pl

@@ -0,0 +1,14 @@
+#!/usr/bin/perl -w
+
+my $str;
+print "Enter a number/string to check if it's palindromic in nature: ";
+chomp ($str = <STDIN>);
+
+my $revStr = reverse $str;
+
+if(uc($revStr) ne uc($str)){
+  print "Not palindromic";
+}
+else{
+  print "Palindromic";
+}