Merge pull request #9496 from Firedrake/rogerbw-challenge-254

RogerBW solutions for challenge no. 254

21 files changed, 1078 insertions, 0 deletions

diff --git a/challenge-254/roger-bell-west/javascript/ch-1.js b/challenge-254/roger-bell-west/javascript/ch-1.js
new file mode 100755
index 0000000000..ea5bcfa91f
--- /dev/null
+++ b/challenge-254/roger-bell-west/javascript/ch-1.js
@@ -0,0 +1,46 @@
+#! /usr/bin/node
+
+"use strict"
+
+function threepower(n0) {
+    if (n0 == 0) {
+        return false;
+    }
+    let n = Math.abs(n0);
+    let lo = 1;
+    let hi = Math.floor(n / 2);
+    while (true) {
+        const t = Math.floor((lo + hi) / 2);
+        const c = t * t * t;
+        if (c == n) {
+            return true;
+        }
+        if (lo == t) {
+            return false;
+        }
+        if (c < n) {
+            lo = t;
+        } else {
+            hi = t;
+        }
+    }
+}
+
+if (threepower(27)) {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write(" ");
+if (!threepower(0)) {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write(" ");
+if (!threepower(6)) {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write("\n");
diff --git a/challenge-254/roger-bell-west/javascript/ch-2.js b/challenge-254/roger-bell-west/javascript/ch-2.js
new file mode 100755
index 0000000000..0386bdcdb4
--- /dev/null
+++ b/challenge-254/roger-bell-west/javascript/ch-2.js
@@ -0,0 +1,67 @@
+#! /usr/bin/node
+
+"use strict"
+
+function is_vowel(c) {
+    switch (c.toLowerCase()) {
+    case "a":
+        return true;
+    case "e":
+        return true;
+    case "i":
+        return true;
+    case "o":
+        return true;
+    case "u":
+        return true;
+    default:
+        return false;
+    }
+}
+
+function reversevowels(a) {
+    const p = a.split("");
+    const q = p.filter(c => is_vowel(c));
+    let qi = q.length;
+    let o = [];
+    for (let c of p) {
+        if (is_vowel(c)) {
+            qi -= 1;
+            let nc = q[qi];
+            if (c.toUpperCase() == c) {
+                nc = nc.toUpperCase();
+            } else {
+                nc = nc.toLowerCase();
+            }
+            o.push(nc);
+        } else {
+            o.push(c);
+        }
+    }
+    return o.join("");
+}
+
+if (reversevowels('Raku') == 'Ruka') {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write(" ");
+if (reversevowels('Perl') == 'Perl') {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write(" ");
+if (reversevowels('Julia') == 'Jaliu') {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write(" ");
+if (reversevowels('Uiua') == 'Auiu') {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write("\n");
diff --git a/challenge-254/roger-bell-west/kotlin/ch-1.kt b/challenge-254/roger-bell-west/kotlin/ch-1.kt
new file mode 100644
index 0000000000..4461e0a14d
--- /dev/null
+++ b/challenge-254/roger-bell-west/kotlin/ch-1.kt
@@ -0,0 +1,46 @@
+fun threepower(n0: Int): Boolean {
+    if (n0 == 0) {
+        return false
+    }
+    val n = Math.abs(n0)
+    var lo = 1
+    var hi = n / 2
+    while (true) {
+        val t = (lo + hi) / 2
+        val c = t * t * t
+        if (c == n) {
+            return true
+        }
+        if (lo == t) {
+            return false
+        }
+        if (c < n) {
+            lo = t
+        } else {
+            hi = t
+        }
+    }
+}
+
+fun main() {
+
+    if (threepower(27)) {
+        print("Pass")
+    } else {
+        print("Fail")
+    }
+    print(" ")
+    if (!threepower(0)) {
+        print("Pass")
+    } else {
+        print("Fail")
+    }
+    print(" ")
+    if (!threepower(6)) {
+        print("Pass")
+    } else {
+        print("Fail")
+    }
+    println("")
+
+}
diff --git a/challenge-254/roger-bell-west/kotlin/ch-2.kt b/challenge-254/roger-bell-west/kotlin/ch-2.kt
new file mode 100644
index 0000000000..69eedcfb34
--- /dev/null
+++ b/challenge-254/roger-bell-west/kotlin/ch-2.kt
@@ -0,0 +1,56 @@
+fun is_vowel(c: Char): Boolean {
+    return when (c.lowercaseChar()) {
+        'a', 'e', 'i', 'o', 'u' -> true
+        else -> false
+    }
+}
+fun reversevowels(a: String): String {
+    val p = a.toCharArray().toList()
+    val q = p.filter{is_vowel(it)}
+    var qi = q.size
+    var o = ArrayList<Char>()
+    for (c in p) {
+        if (is_vowel(c)) {
+            qi -= 1;
+            var nc = q[qi]
+            if (c.isUpperCase()) {
+                nc = nc.uppercaseChar()
+            } else {
+                nc = nc.lowercaseChar()
+            }
+            o.add(nc)
+        } else {
+            o.add(c)
+        }
+    }
+    return o.joinToString("")
+}
+
+fun main() {
+
+    if (reversevowels("Raku") == "Ruka") {
+        print("Pass")
+    } else {
+        print("Fail")
+    }
+    print(" ")
+    if (reversevowels("Perl") == "Perl") {
+        print("Pass")
+    } else {
+        print("Fail")
+    }
+    print(" ")
+    if (reversevowels("Julia") == "Jaliu") {
+        print("Pass")
+    } else {
+        print("Fail")
+    }
+    print(" ")
+    if (reversevowels("Uiua") == "Auiu") {
+        print("Pass")
+    } else {
+        print("Fail")
+    }
+    println("")
+
+}
diff --git a/challenge-254/roger-bell-west/lua/ch-1.lua b/challenge-254/roger-bell-west/lua/ch-1.lua
new file mode 100755
index 0000000000..f76b1db415
--- /dev/null
+++ b/challenge-254/roger-bell-west/lua/ch-1.lua
@@ -0,0 +1,47 @@
+#! /usr/bin/lua
+
+function threepower(n0)
+   if n0 == 0 then
+      return false
+   end
+   local n = math.abs(n0)
+   local lo = 1
+   local hi = math.floor(n / 2)
+   while true do
+      local t= math.floor((lo + hi) / 2)
+      local c = t * t * t
+      if c == n then
+         return true
+      end
+      if lo == t then
+         return false
+      end
+      if c < n then
+         lo = t
+      else
+         hi = t
+      end
+   end
+end
+
+if threepower(27) then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+io.write(" ")
+
+if not threepower(0) then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+io.write(" ")
+
+if not threepower(6) then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+print("")
+
diff --git a/challenge-254/roger-bell-west/lua/ch-2.lua b/challenge-254/roger-bell-west/lua/ch-2.lua
new file mode 100755
index 0000000000..0751ba8dae
--- /dev/null
+++ b/challenge-254/roger-bell-west/lua/ch-2.lua
@@ -0,0 +1,67 @@
+#! /usr/bin/lua
+
+function is_vowel(c)
+   if string.find(string.lower(c), "[aeiou]") == 1 then
+      return true
+   else
+      return false
+   end
+end
+
+function reversevowels(a)
+   local p = {}
+   local q = {}
+   for i = 1, string.len(a) do
+      local c = string.sub(a, i, i)
+      table.insert(p, c)
+      if is_vowel(c) then
+         table.insert(q, c)
+      end
+   end
+   local qi = #q
+   local o = ""
+   for _, c in ipairs(p) do
+      if is_vowel(c) then
+         nc = q[qi]
+         qi = qi - 1
+         if string.upper(c) == c then
+            nc = string.upper(nc)
+         else
+            nc = string.lower(nc)
+         end
+         o = o .. nc
+      else
+         o = o .. c
+      end
+   end
+   return o
+end
+
+if reversevowels("Raku") == "Ruka" then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+io.write(" ")
+
+if reversevowels("Perl") == "Perl" then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+io.write(" ")
+
+if reversevowels("Julia") == "Jaliu" then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+io.write(" ")
+
+if reversevowels("Uiua") == "Auiu" then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+print("")
+
diff --git a/challenge-254/roger-bell-west/perl/ch-1.pl b/challenge-254/roger-bell-west/perl/ch-1.pl
new file mode 100755
index 0000000000..64077004d8
--- /dev/null
+++ b/challenge-254/roger-bell-west/perl/ch-1.pl
@@ -0,0 +1,35 @@
+#! /usr/bin/perl
+
+use strict;
+use warnings;
+use experimental 'signatures';
+
+use Test::More tests => 3;
+
+is(threepower(27), 1, 'example 1');
+is(threepower(0), 0, 'example 2');
+is(threepower(6), 0, 'example 3');
+
+sub threepower($n0) {
+  if ($n0 == 0) {
+    return 0;
+  }
+  my $n = abs($n0);
+  my $lo = 1;
+  my $hi = int($n / 2);
+  while (1) {
+    my $t = int(($lo + $hi) / 2);
+    my $c = $t * $t * $t;
+    if ($c == $n) {
+      return 1;
+    }
+    if ($lo == $t) {
+      return 0;
+    }
+    if ($c < $n) {
+      $lo = $t;
+    } else {
+      $hi = $t;
+    }
+  }
+}
diff --git a/challenge-254/roger-bell-west/perl/ch-2.pl b/challenge-254/roger-bell-west/perl/ch-2.pl
new file mode 100755
index 0000000000..879bdbb9fb
--- /dev/null
+++ b/challenge-254/roger-bell-west/perl/ch-2.pl
@@ -0,0 +1,42 @@
+#! /usr/bin/perl
+
+use strict;
+use warnings;
+use experimental 'signatures';
+
+use Test::More tests => 4;
+
+is(reversevowels('Raku'), 'Ruka', 'example 1');
+is(reversevowels('Perl'), 'Perl', 'example 2');
+is(reversevowels('Julia'), 'Jaliu', 'example 3');
+is(reversevowels('Uiua'), 'Auiu', 'example 4');
+
+sub is_vowel($c) {
+  if ($c =~ /[aeiou]/i) {
+    return 1;
+  } else {
+    return 0;
+  }
+}
+
+sub reversevowels($a) {
+  my @p = split('', $a);
+  my @q = grep {is_vowel($_)} @p;
+  my $qi = scalar @q;
+  my @o;
+  foreach my $c (@p) {
+    if (is_vowel($c)) {
+      $qi--;
+      my $nc = $q[$qi];
+      if ($c eq uc($c)) {
+        $nc = uc($nc);
+      } else {
+        $nc = lc($nc);
+      }
+      push @o, $nc;
+    } else {
+      push @o, $c;
+    }
+  }
+  return join('', @o);
+}
diff --git a/challenge-254/roger-bell-west/postscript/ch-1.ps b/challenge-254/roger-bell-west/postscript/ch-1.ps
new file mode 100644
index 0000000000..f05cec0e91
--- /dev/null
+++ b/challenge-254/roger-bell-west/postscript/ch-1.ps
@@ -0,0 +1,73 @@
+%!PS
+
+% begin included library code
+% see https://codeberg.org/Firedrake/postscript-libraries/
+/test.end {
+    ( ) print
+    test.count 0 gt {
+        (Passed ) print
+        test.pass (...) cvs print
+        (/) print
+        test.count (...) cvs print
+        ( \() print
+        test.pass 100 mul test.count idiv (...) cvs print
+        (%\)) print
+        (\r\n) print
+    } if
+} bind def
+
+/test {
+    /test.count test.count 1 add def
+    {
+        /test.pass test.pass 1 add def
+    } {
+        ( ) print
+        test.count (....) cvs print
+        (-fail) print
+    } ifelse
+} bind def
+
+/test.start {
+    print (:) print
+    /test.pass 0 def
+    /test.count 0 def
+} bind def
+
+
+% end included library code
+
+/threepower {
+    0 dict begin
+    /n exch def
+    n 0 eq {
+        false
+    } {
+        /n n abs def
+        /lo 1 def
+        /hi n 2 idiv def
+        {
+            /t lo hi add 2 idiv def
+            /c t dup dup mul mul def
+            c n eq {
+                true
+                exit
+            } if
+            lo t eq {
+                false
+                exit
+            } if
+            c n lt {
+                /lo t def
+            } {
+                /hi t def
+            } ifelse
+        } loop
+    } ifelse
+    end
+} bind def
+
+(threepower) test.start
+27 threepower test
+0 threepower not test
+6 threepower not test
+test.end
diff --git a/challenge-254/roger-bell-west/postscript/ch-2.ps b/challenge-254/roger-bell-west/postscript/ch-2.ps
new file mode 100644
index 0000000000..743759e592
--- /dev/null
+++ b/challenge-254/roger-bell-west/postscript/ch-2.ps
@@ -0,0 +1,136 @@
+%!PS
+
+% begin included library code
+% see https://codeberg.org/Firedrake/postscript-libraries/
+/s2a {
+    [ exch { } forall ]
+} bind def
+
+/a2s {
+    2 dict begin
+    /i exch def
+    i length dup string /o exch def
+    1 sub 0 exch 1 exch {
+        dup i 3 -1 roll get o 3 1 roll put
+    } for
+    o
+    end
+} bind def
+
+/filter { % array proc(bool) -> array
+    1 dict begin
+    /p exch def
+    [ exch
+      {
+          dup p not
+          {
+              pop
+          } if
+      } forall
+    ]
+    end
+} bind def
+
+/test.start {
+    print (:) print
+    /test.pass 0 def
+    /test.count 0 def
+} bind def
+
+/test.end {
+    ( ) print
+    test.count 0 gt {
+        (Passed ) print
+        test.pass (...) cvs print
+        (/) print
+        test.count (...) cvs print
+        ( \() print
+        test.pass 100 mul test.count idiv (...) cvs print
+        (%\)) print
+        (\r\n) print
+    } if
+} bind def
+
+/test {
+    /test.count test.count 1 add def
+    {
+        /test.pass test.pass 1 add def
+    } {
+        ( ) print
+        test.count (....) cvs print
+        (-fail) print
+    } ifelse
+} bind def
+
+/toupper {
+    s2a
+    [ exch
+      {
+          dup dup 97 ge exch 122 le and {
+              32 sub
+          } if
+      } forall
+    ] a2s
+} bind def
+
+/tolower {
+    s2a
+    [ exch
+      {
+          dup dup 65 ge exch 90 le and {
+              32 add
+          } if
+      } forall
+    ] a2s
+} bind def
+
+
+% end included library code
+
+/is_vowel {
+    << 65 true
+       69 true
+       73 true
+       79 true
+       85 true
+       97 true
+       101 true
+       105 true
+       111 true
+       117 true >>
+    exch known
+} bind def
+
+/reversevowels {
+    0 dict begin
+    /p exch s2a def
+    /q p { is_vowel } filter def
+    /qi q length def
+    [
+        p {
+            /c exch def
+            c is_vowel {
+                /qi qi 1 sub def
+                /nc q qi get def
+                c 65 ge c 90 le and {
+                    1 string dup 0 nc put toupper 0 get /nc exch def
+                } {
+                    c 97 ge c 122 le and {
+                        1 string dup 0 nc put tolower 0 get /nc exch def
+                    } if
+                } ifelse
+                nc
+            } {
+                c
+            } ifelse
+        } forall
+    ] a2s
+    end
+} bind def
+
+(reversevowels) test.start
+(Raku) reversevowels (Ruka) eq test
+(Perl) reversevowels (Perl) eq test
+(Julia) reversevowels (Jaliu) eq test
+(Uiua) reversevowels (Auiu) eq test
+test.end
diff --git a/challenge-254/roger-bell-west/python/ch-1.py b/challenge-254/roger-bell-west/python/ch-1.py
new file mode 100755
index 0000000000..80b30293ea
--- /dev/null
+++ b/challenge-254/roger-bell-west/python/ch-1.py
@@ -0,0 +1,34 @@
+#! /usr/bin/python3
+
+def threepower(n0):
+  if n0 == 0:
+    return False
+  n = abs(n0)
+  lo = 1
+  hi = int(n / 2)
+  while True:
+    t = int((lo + hi) / 2)
+    c = t * t * t
+    if c == n:
+      return True
+    if lo == t:
+      return False
+    if c < n:
+      lo = t
+    else:
+      hi = t
+
+import unittest
+
+class TestThreepower(unittest.TestCase):
+
+  def test_ex1(self):
+    self.assertEqual(threepower(27), True, 'example 1')
+
+  def test_ex2(self):
+    self.assertEqual(threepower(0), False, 'example 2')
+
+  def test_ex3(self):
+    self.assertEqual(threepower(6), False, 'example 3')
+
+unittest.main()
diff --git a/challenge-254/roger-bell-west/python/ch-2.py b/challenge-254/roger-bell-west/python/ch-2.py
new file mode 100755
index 0000000000..3a206826be
--- /dev/null
+++ b/challenge-254/roger-bell-west/python/ch-2.py
@@ -0,0 +1,43 @@
+#! /usr/bin/python3
+
+def is_vowel(c):
+  match c.lower():
+    case 'a' | 'e' | 'i' | 'o' | 'u':
+      return True
+    case _:
+      return False
+
+def reversevowels(a):
+  q = [c for c in a if is_vowel(c)]
+  qi = len(q)
+  o = []
+  for c in a:
+    if is_vowel(c):
+      qi -= 1
+      nc = q[qi]
+      if c.isupper():
+        nc = nc.upper()
+      else:
+        nc = nc.lower()
+      o.append(nc)
+    else:
+      o.append(c)
+  return "".join(o)
+
+import unittest
+
+class TestReversevowels(unittest.TestCase):
+
+  def test_ex1(self):
+    self.assertEqual(reversevowels("Raku"), "Ruka", 'example 1')
+
+  def test_ex2(self):
+    self.assertEqual(reversevowels("Perl"), "Perl", 'example 2')
+
+  def test_ex3(self):
+    self.assertEqual(reversevowels("Julia"), "Jaliu", 'example 3')
+
+  def test_ex4(self):
+    self.assertEqual(reversevowels("Uiua"), "Auiu", 'example 4')
+
+unittest.main()
diff --git a/challenge-254/roger-bell-west/raku/ch-1.p6 b/challenge-254/roger-bell-west/raku/ch-1.p6
new file mode 100755
index 0000000000..f0f09cac8d
--- /dev/null
+++ b/challenge-254/roger-bell-west/raku/ch-1.p6
@@ -0,0 +1,33 @@
+#! /usr/bin/raku
+
+use Test;
+
+plan 3;
+
+is(threepower(27), True, 'example 1');
+is(threepower(0), False, 'example 2');
+is(threepower(6), False, 'example 3');
+
+sub threepower($n0) {
+    if ($n0 == 0) {
+        return False;
+    }
+    my $n = abs($n0);
+    my $lo = 1;
+    my Int $hi = $n div 2;
+    while (True) {
+        my Int $t = ($lo + $hi) div 2;
+        my $c = $t * $t * $t;
+        if ($c == $n) {
+            return True;
+        }
+        if ($lo == $t) {
+            return False;
+        }
+        if ($c < $n) {
+            $lo = $t;
+        } else {
+            $hi = $t;
+        }
+    }
+}
diff --git a/challenge-254/roger-bell-west/raku/ch-2.p6 b/challenge-254/roger-bell-west/raku/ch-2.p6
new file mode 100755
index 0000000000..e62d934ce5
--- /dev/null
+++ b/challenge-254/roger-bell-west/raku/ch-2.p6
@@ -0,0 +1,40 @@
+#! /usr/bin/raku
+
+use Test;
+
+plan 4;
+
+is(reversevowels('Raku'), 'Ruka', 'example 1');
+is(reversevowels('Perl'), 'Perl', 'example 2');
+is(reversevowels('Julia'), 'Jaliu', 'example 3');
+is(reversevowels('Uiua'), 'Auiu', 'example 4');
+
+sub is_vowel($c) {
+    if ($c ~~ m:i/<[aeiou]>/) {
+        return True;
+    } else {
+        return False;
+    }
+}
+
+sub reversevowels($a) {
+    my @p = $a.comb();
+    my @q = @p.grep({is_vowel($_)});
+    my $qi = @q.elems;
+    my @o;
+    for @p -> $c {
+        if (is_vowel($c)) {
+            $qi--;
+            my $nc = @q[$qi];
+            if ($c eq uc($c)) {
+                $nc = uc($nc);
+            } else {
+                $nc = lc($nc);
+            }
+            @o.push($nc);
+        } else {
+            @o.push($c);
+        }
+    }
+    return @o.join('');
+}
diff --git a/challenge-254/roger-bell-west/ruby/ch-1.rb b/challenge-254/roger-bell-west/ruby/ch-1.rb
new file mode 100755
index 0000000000..530cbb8229
--- /dev/null
+++ b/challenge-254/roger-bell-west/ruby/ch-1.rb
@@ -0,0 +1,43 @@
+#! /usr/bin/ruby
+
+def threepower(n0)
+  if n0 == 0 then
+    return false
+  end
+  n = n0.abs
+  lo = 1
+  hi = n.div(2)
+  while true do
+    t = (lo + hi).div(2)
+    c = t * t * t
+    if c == n then
+      return true
+    end
+    if lo == t then
+      return false
+    end
+    if c < n then
+      lo = t
+    else
+      hi = t
+    end
+  end
+end
+
+require 'test/unit'
+
+class TestThreepower < Test::Unit::TestCase
+
+  def test_ex1
+    assert_equal(true, threepower(27))
+  end
+
+  def test_ex2
+    assert_equal(false, threepower(0))
+  end
+
+  def test_ex3
+    assert_equal(false, threepower(6))
+  end
+
+end
diff --git a/challenge-254/roger-bell-west/ruby/ch-2.rb b/challenge-254/roger-bell-west/ruby/ch-2.rb
new file mode 100755
index 0000000000..7e0413801d
--- /dev/null
+++ b/challenge-254/roger-bell-west/ruby/ch-2.rb
@@ -0,0 +1,53 @@
+#! /usr/bin/ruby
+
+def is_vowel(c)
+  if c.downcase =~ /[aeiou]/ then
+    return true
+  else
+    return false
+  end
+end
+
+def reversevowels(a)
+  p = a.split('')
+  q = p.find_all { |c| is_vowel(c) }
+  qi = q.length
+  o = []
+  p.each do |c|
+    if is_vowel(c)
+      qi -= 1
+      nc = q[qi]
+      if c == c.upcase then
+        nc = nc.upcase
+      else
+        nc = nc.downcase
+      end
+      o.push(nc)
+    else
+      o.push(c)
+    end
+  end
+  return o.join("")
+end
+
+require 'test/unit'
+
+class TestReversevowels < Test::Unit::TestCase
+
+  def test_ex1
+    assert_equal('Ruka', reversevowels('Raku'))
+  end
+
+  def test_ex2
+    assert_equal('Perl', reversevowels('Perl'))
+  end
+
+  def test_ex3
+    assert_equal('Jaliu', reversevowels('Julia'))
+  end
+
+  def test_ex4
+    assert_equal('Auiu', reversevowels('Uiua'))
+  end
+
+end
diff --git a/challenge-254/roger-bell-west/rust/ch-1.rs b/challenge-254/roger-bell-west/rust/ch-1.rs
new file mode 100755
index 0000000000..cf992ffd44
--- /dev/null
+++ b/challenge-254/roger-bell-west/rust/ch-1.rs
@@ -0,0 +1,41 @@
+#! /bin/sh
+//usr/bin/env rustc --test $0 -o ${0}x && ./${0}x --nocapture; rm -f ${0}x ; exit
+
+#[test]
+fn test_ex1() {
+    assert_eq!(threepower(27), true);
+}
+
+#[test]
+fn test_ex2() {
+    assert_eq!(threepower(0), false);
+}
+
+#[test]
+fn test_ex3() {
+    assert_eq!(threepower(6), false);
+}
+
+fn threepower(n0: i32) -> bool {
+    if n0 == 0 {
+        return false;
+    }
+    let n = n0.abs();
+    let mut lo = 1;
+    let mut hi = n / 2;
+    loop {
+        let t = (lo + hi) / 2;
+        let c = t * t * t;
+        if c == n {
+            return true;
+        }
+        if lo == t {
+            return false;
+        }
+        if c < n {
+            lo = t;
+        } else {
+            hi = t;
+        }
+    }
+}
diff --git a/challenge-254/roger-bell-west/rust/ch-2.rs b/challenge-254/roger-bell-west/rust/ch-2.rs
new file mode 100755
index 0000000000..ed16b36e2e
--- /dev/null
+++ b/challenge-254/roger-bell-west/rust/ch-2.rs
@@ -0,0 +1,51 @@
+#! /bin/sh
+//usr/bin/env rustc --test $0 -o ${0}x && ./${0}x --nocapture; rm -f ${0}x ; exit
+
+#[test]
+fn test_ex1() {
+    assert_eq!(reversevowels("Raku"), "Ruka");
+}
+
+#[test]
+fn test_ex2() {
+    assert_eq!(reversevowels("Perl"), "Perl");
+}
+
+#[test]
+fn test_ex3() {
+    assert_eq!(reversevowels("Julia"), "Jaliu");
+}
+
+#[test]
+fn test_ex4() {
+    assert_eq!(reversevowels("Uiua"), "Auiu");
+}
+
+fn is_vowel(c: char) -> bool {
+    match c.to_ascii_lowercase() {
+        'a' | 'e' | 'i' | 'o' | 'u' => true,
+        _ => false,
+    }
+}
+
+fn reversevowels(a: &str) -> String {
+    let p = a.chars().collect::<Vec<_>>();
+    let q = p.iter().filter(|c| is_vowel(**c)).collect::<Vec<_>>();
+    let mut qi = q.len();
+    let mut o: Vec<char> = Vec::new();
+    for c in &p {
+        if is_vowel(*c) {
+            qi -= 1;
+            let mut nc = *q[qi];
+            if c.is_uppercase() {
+                nc = nc.to_ascii_uppercase();
+            } else {
+                nc = nc.to_ascii_lowercase();
+            }
+            o.push(nc);
+        } else {
+            o.push(*c);
+        }
+    }
+    o.iter().collect::<String>()
+}
diff --git a/challenge-254/roger-bell-west/scala/ch-1.scala b/challenge-254/roger-bell-west/scala/ch-1.scala
new file mode 100644
index 0000000000..58f2c83a25
--- /dev/null
+++ b/challenge-254/roger-bell-west/scala/ch-1.scala
@@ -0,0 +1,48 @@
+
+object Threepower {
+  def threepower(n0: Int): Boolean = {
+    if (n0 == 0) {
+      return false
+    }
+    var n = n0.abs
+    var lo = 1
+    var hi = n / 2
+    while (true) {
+      val t = (lo + hi) / 2
+      val c = t * t * t
+      if (c == n) {
+        return true
+      }
+      if (lo == t) {
+        return false
+      }
+      if (c < n) {
+        lo = t
+      } else {
+        hi = t
+      }
+    }
+    return false
+  }
+  def ma