Merge pull request #1976 from x1mandi/ch70

Solution for challenge-070 taks1 in Perl by x1mandi.

2 files changed, 45 insertions, 0 deletions

diff --git a/challenge-070/x1mandi/README b/challenge-070/x1mandi/README
new file mode 100644
index 0000000000..f579b0b193
--- /dev/null
+++ b/challenge-070/x1mandi/README
@@ -0,0 +1 @@
+Solution by Csaba Simandi.
diff --git a/challenge-070/x1mandi/perl/ch-1.pl b/challenge-070/x1mandi/perl/ch-1.pl
new file mode 100644
index 0000000000..29bfe36675
--- /dev/null
+++ b/challenge-070/x1mandi/perl/ch-1.pl
@@ -0,0 +1,44 @@
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+use diagnostics;
+use utf8;
+use 5.26.0;
+#promt for a string from user (keyboard input)
+
+my $S = $ARGV[0] || "Perlmongers";
+my $C = $ARGV[1] || 3;
+my $O = $ARGV[2] || 4;
+
+print character_swapping($S, $C, $O)."\n";
+
+sub character_swapping {
+    my ($s, $c, $o) = @_;
+    my $N = length($s);
+    
+    die "ERROR: Missing string.\n" unless defined $s;
+    die "ERROR: Missing swap count.\n" unless defined $c;
+    die "ERROR: Missing offset.\n" unless defined $o;
+    die "ERROR: Invalid swap count [$c].\n" unless ( $c >= 1 ); 
+    die "ERROR: Invalid offset [$o].\n" unless ( $o >= 1 );
+   #Why swap count cannot be greater that offset? Checked $S=abcd, $C=2, $O=1 and the output is "bcda" 
+    die "ERROR: Swap count [$c] is greater than offset [$o].\n" unless ( $c <= $o );
+   # When $N = $c-1  
+    die "ERROR: Invalid string length [$N] for given swap count and offset [$c + $o].\n"
+      unless ( ($c + $o) <= $N);
+    
+    my @chars = split //, $s;
+    
+    #Why is swapping not applied to the first character at index 0?
+    for (1..$c) {
+      my $firstchar = $chars[$_ % $N];
+      my $secondchar = $chars[ ($_+$o) % $N];
+      
+      $chars[($_+$o) % $N] = $firstchar; 
+      $chars[$_ % $N] = $secondchar;      
+    }
+    
+    $s = join('', @chars);
+    return $s;
+}
\ No newline at end of file