Merge pull request #930 from Firedrake/rogerbw-challenge-034

Answers to challenge #34

2 files changed, 125 insertions, 0 deletions

diff --git a/challenge-034/roger-bell-west/perl5/ch-2.pl b/challenge-034/roger-bell-west/perl5/ch-2.pl
new file mode 100755
index 0000000000..133f0b7fc6
--- /dev/null
+++ b/challenge-034/roger-bell-west/perl5/ch-2.pl
@@ -0,0 +1,64 @@
+#! /usr/bin/perl
+
+use strict;
+use warnings;
+
+my @stack=();
+
+my %op=(
+  add => \&add,
+  '+' => \&add,
+  sub => \&sub,
+  '-' => \&sub,
+  mul => \&mul,
+  '*' => \&mul,
+  div => \&div,
+  '/' => \&div,
+  neg => \&neg,
+  dup => \&dup,
+  pop => \&pop,
+  exch => \&exch,
+    );
+
+foreach my $p (@ARGV) {
+  if (exists $op{$p}) {
+    $op{$p}->();
+  } elsif ($p =~ /^[.0-9]+$/) {
+    push @stack,$p;
+  } else {
+    die "Unknown input $p\n";
+  }
+  print join(' ',@stack),"\n";
+}
+
+sub add {
+  push @stack,(pop @stack) + (pop @stack);
+}
+
+sub sub {
+  push @stack,-((pop @stack) - (pop @stack));
+}
+
+sub mul {
+  push @stack,(pop @stack) * (pop @stack);
+}
+
+sub div {
+  push @stack,1/((pop @stack) / (pop @stack));
+}
+
+sub neg {
+  push @stack,-(pop @stack);
+}
+
+sub dup {
+  push @stack,$stack[-1];
+}
+
+sub pop {
+  pop @stack;
+}
+
+sub exch {
+  ($stack[-1],$stack[-2])=($stack[-2],$stack[-1]);
+}
diff --git a/challenge-034/roger-bell-west/perl6/ch-2.p6 b/challenge-034/roger-bell-west/perl6/ch-2.p6
new file mode 100755
index 0000000000..ab7252072d
--- /dev/null
+++ b/challenge-034/roger-bell-west/perl6/ch-2.p6
@@ -0,0 +1,61 @@
+#! /usr/bin/perl6
+
+my @stack=();
+
+my %op=(
+  add => &add,
+  '+' => &add,
+  sub => &sub,
+  '-' => &sub,
+  mul => &mul,
+  '*' => &mul,
+  div => &div,
+  '/' => &div,
+  neg => &neg,
+  dup => &dup,
+  pop => &pop,
+  exch => &exch,
+    );
+
+for @*ARGS -> $p {
+  if (%op{$p}:exists) {
+    %op{$p}.();
+  } elsif ($p ~~ /^<[.0..9]>+$/) {
+    push @stack,$p;
+  } else {
+    die "Unknown input $p\n";
+  }
+  say join(' ',@stack);
+}
+
+sub add {
+  push @stack,(@stack.pop) + (@stack.pop);
+}
+
+sub sub {
+  push @stack,-((@stack.pop) - (@stack.pop));
+}
+
+sub mul {
+  push @stack,(@stack.pop) * (@stack.pop);
+}
+
+sub div {
+  push @stack,1/((@stack.pop) / (@stack.pop));
+}
+
+sub neg {
+  push @stack,-(@stack.pop);
+}
+
+sub dup {
+  push @stack,@stack[* -1];
+}
+
+sub pop {
+  @stack.pop;
+}
+
+sub exch {
+  (@stack[* -1],@stack[* -2])=(@stack[* -2],@stack[* -1]);
+}