diff --git a/.gitignore b/.gitignore
index 75596ab..3ecf467 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,3 +8,18 @@ out/
 build/
 .gradle/
 .DS_Store
+
+# C++ build artifacts
+**/CMakeCache.txt
+**/CMakeFiles/
+**/Makefile
+**/cmake_install.cmake
+**/CTestTestfile.cmake
+**/_deps/
+**/lib/
+**/*.o
+**/*.d
+**/sample_test_*
+
+# C build artifacts
+**/*.a
diff --git a/c/src/supermarket.c b/c/src/supermarket.c
index 414ce1d..a9c67d3 100644
--- a/c/src/supermarket.c
+++ b/c/src/supermarket.c
@@ -76,22 +76,22 @@ void handle_offers(struct cart_t* cart, struct receipt_t* receipt, struct specia
             int x = 1;
 
             if (offer->type == ThreeForTwo) {
-                x = 3;
+                x = THREE_FOR_TWO_QUANTITY;
             } else if (offer->type == TwoForAmount) {
-                x = 2;
-                if (quantityAsInt >= 2) {
-                    double total = offer->argument * (quantityAsInt / x) + quantityAsInt % 2 * unitPrice;
+                x = TWO_FOR_OFFER_QUANTITY;
+                if (quantityAsInt >= TWO_FOR_OFFER_QUANTITY) {
+                    double total = offer->argument * (quantityAsInt / x) + quantityAsInt % TWO_FOR_OFFER_QUANTITY * unitPrice;
                     double discountN = unitPrice * quantity - total;
                     char description[MAX_NAME_LENGTH];
                     sprintf(description, "2 for %f", offer->argument);
                     discount = discount_create(description, -discountN, &product);
                 }
             } if (offer->type == FiveForAmount) {
-                x = 5;
+                x = FIVE_FOR_OFFER_QUANTITY;
             }
             int numberOfXs = quantityAsInt / x;
-            if (offer->type == ThreeForTwo && quantityAsInt > 2) {
-                double discountAmount = quantity * unitPrice - ((numberOfXs * 2 * unitPrice) + quantityAsInt % 3 * unitPrice);
+            if (offer->type == ThreeForTwo && quantityAsInt > TWO_FOR_OFFER_QUANTITY) {
+                double discountAmount = quantity * unitPrice - ((numberOfXs * TWO_FOR_OFFER_QUANTITY * unitPrice) + quantityAsInt % THREE_FOR_TWO_QUANTITY * unitPrice);
                 char description[MAX_NAME_LENGTH];
                 sprintf(description, "3 for 2");
                 discount = discount_create(description, -discountAmount, &product);
@@ -99,11 +99,11 @@ void handle_offers(struct cart_t* cart, struct receipt_t* receipt, struct specia
             if (offer->type == TenPercentDiscount) {
                 char description[MAX_NAME_LENGTH];
                 sprintf(description, "%.0f%% off", offer->argument);
-                discount = discount_create(description, -quantity * unitPrice * offer->argument / 100.0, &product);
+                discount = discount_create(description, -quantity * unitPrice * offer->argument / PERCENTAGE_DIVISOR, &product);
 
             }
-            if (offer->type == FiveForAmount && quantityAsInt >= 5) {
-                double discountTotal = unitPrice * quantity - (offer->argument * numberOfXs + quantityAsInt % 5 * unitPrice);
+            if (offer->type == FiveForAmount && quantityAsInt >= FIVE_FOR_OFFER_QUANTITY) {
+                double discountTotal = unitPrice * quantity - (offer->argument * numberOfXs + quantityAsInt % FIVE_FOR_OFFER_QUANTITY * unitPrice);
                 char description[MAX_NAME_LENGTH];
                 sprintf(description, "%d for %f", x, offer->argument);
                 discount = discount_create(description, -discountTotal, &product);
diff --git a/c/src/supermarket.h b/c/src/supermarket.h
index 20085a9..36064b0 100644
--- a/c/src/supermarket.h
+++ b/c/src/supermarket.h
@@ -16,6 +16,14 @@ enum SpecialOfferType {
 #define MAX_NAME_LENGTH 100
 #define MAX_PRODUCTS 100
 
+// Special offer quantity constants
+#define TWO_FOR_OFFER_QUANTITY 2
+#define THREE_FOR_TWO_QUANTITY 3
+#define FIVE_FOR_OFFER_QUANTITY 5
+
+// Percentage conversion constant
+#define PERCENTAGE_DIVISOR 100.0
+
 struct product_t {
     char name[MAX_NAME_LENGTH];
     enum unit unit;
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+.PHONY : Offer.cpp.i
+
+Offer.s: Offer.cpp.s
+.PHONY : Offer.s
+
+# target to generate assembly for a file
+Offer.cpp.s:
+	cd /home/runner/work/Refactoring-Kata/Refactoring-Kata/cpp && $(MAKE) $(MAKESILENT) -f src/CMakeFiles/src.dir/build.make src/CMakeFiles/src.dir/Offer.cpp.s
+.PHONY : Offer.cpp.s
+
+Product.o: Product.cpp.o
+.PHONY : Product.o
+
+# target to build an object file
+Product.cpp.o:
+	cd /home/runner/work/Refactoring-Kata/Refactoring-Kata/cpp && $(MAKE) $(MAKESILENT) -f src/CMakeFiles/src.dir/build.make src/CMakeFiles/src.dir/Product.cpp.o
+.PHONY : Product.cpp.o
+
+Product.i: Product.cpp.i
+.PHONY : Product.i
+
+# target to preprocess a source file
+Product.cpp.i:
+	cd /home/runner/work/Refactoring-Kata/Refactoring-Kata/cpp && $(MAKE) $(MAKESILENT) -f src/CMakeFiles/src.dir/build.make src/CMakeFiles/src.dir/Product.cpp.i
+.PHONY : Product.cpp.i
+
+Product.s: Product.cpp.s
+.PHONY : Product.s
+
+# target to generate assembly for a file
+Product.cpp.s:
+	cd /home/runner/work/Refactoring-Kata/Refactoring-Kata/cpp && $(MAKE) $(MAKESILENT) -f src/CMakeFiles/src.dir/build.make src/CMakeFiles/src.dir/Product.cpp.s
+.PHONY : Product.cpp.s
+
+ProductQuantity.o: ProductQuantity.cpp.o
+.PHONY : ProductQuantity.o
+
+# target to build an object file
+ProductQuantity.cpp.o:
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+
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+# target to preprocess a source file
+ProductQuantity.cpp.i:
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+
+ProductQuantity.s: ProductQuantity.cpp.s
+.PHONY : ProductQuantity.s
+
+# target to generate assembly for a file
+ProductQuantity.cpp.s:
+	cd /home/runner/work/Refactoring-Kata/Refactoring-Kata/cpp && $(MAKE) $(MAKESILENT) -f src/CMakeFiles/src.dir/build.make src/CMakeFiles/src.dir/ProductQuantity.cpp.s
+.PHONY : ProductQuantity.cpp.s
+
+Receipt.o: Receipt.cpp.o
+.PHONY : Receipt.o
+
+# target to build an object file
+Receipt.cpp.o:
+	cd /home/runner/work/Refactoring-Kata/Refactoring-Kata/cpp && $(MAKE) $(MAKESILENT) -f src/CMakeFiles/src.dir/build.make src/CMakeFiles/src.dir/Receipt.cpp.o
+.PHONY : Receipt.cpp.o
+
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+.PHONY : Receipt.i
+
+# target to preprocess a source file
+Receipt.cpp.i:
+	cd /home/runner/work/Refactoring-Kata/Refactoring-Kata/cpp && $(MAKE) $(MAKESILENT) -f src/CMakeFiles/src.dir/build.make src/CMakeFiles/src.dir/Receipt.cpp.i
+.PHONY : Receipt.cpp.i
+
+Receipt.s: Receipt.cpp.s
+.PHONY : Receipt.s
+
+# target to generate assembly for a file
+Receipt.cpp.s:
+	cd /home/runner/work/Refactoring-Kata/Refactoring-Kata/cpp && $(MAKE) $(MAKESILENT) -f src/CMakeFiles/src.dir/build.make src/CMakeFiles/src.dir/Receipt.cpp.s
+.PHONY : Receipt.cpp.s
+
+ReceiptItem.o: ReceiptItem.cpp.o
+.PHONY : ReceiptItem.o
+
+# target to build an object file
+ReceiptItem.cpp.o:
+	cd /home/runner/work/Refactoring-Kata/Refactoring-Kata/cpp && $(MAKE) $(MAKESILENT) -f src/CMakeFiles/src.dir/build.make src/CMakeFiles/src.dir/ReceiptItem.cpp.o
+.PHONY : ReceiptItem.cpp.o
+
+ReceiptItem.i: ReceiptItem.cpp.i
+.PHONY : ReceiptItem.i
+
+# target to preprocess a source file
+ReceiptItem.cpp.i:
+	cd /home/runner/work/Refactoring-Kata/Refactoring-Kata/cpp && $(MAKE) $(MAKESILENT) -f src/CMakeFiles/src.dir/build.make src/CMakeFiles/src.dir/ReceiptItem.cpp.i
+.PHONY : ReceiptItem.cpp.i
+
+ReceiptItem.s: ReceiptItem.cpp.s
+.PHONY : ReceiptItem.s
+
+# target to generate assembly for a file
+ReceiptItem.cpp.s:
+	cd /home/runner/work/Refactoring-Kata/Refactoring-Kata/cpp && $(MAKE) $(MAKESILENT) -f src/CMakeFiles/src.dir/build.make src/CMakeFiles/src.dir/ReceiptItem.cpp.s
+.PHONY : ReceiptItem.cpp.s
+
+ReceiptPrinter.o: ReceiptPrinter.cpp.o
+.PHONY : ReceiptPrinter.o
+
+# target to build an object file
+ReceiptPrinter.cpp.o:
+	cd /home/runner/work/Refactoring-Kata/Refactoring-Kata/cpp && $(MAKE) $(MAKESILENT) -f src/CMakeFiles/src.dir/build.make src/CMakeFiles/src.dir/ReceiptPrinter.cpp.o
+.PHONY : ReceiptPrinter.cpp.o
+
+ReceiptPrinter.i: ReceiptPrinter.cpp.i
+.PHONY : ReceiptPrinter.i
+
+# target to preprocess a source file
+ReceiptPrinter.cpp.i:
+	cd /home/runner/work/Refactoring-Kata/Refactoring-Kata/cpp && $(MAKE) $(MAKESILENT) -f src/CMakeFiles/src.dir/build.make src/CMakeFiles/src.dir/ReceiptPrinter.cpp.i
+.PHONY : ReceiptPrinter.cpp.i
+
+ReceiptPrinter.s: ReceiptPrinter.cpp.s
+.PHONY : ReceiptPrinter.s
+
+# target to generate assembly for a file
+ReceiptPrinter.cpp.s:
+	cd /home/runner/work/Refactoring-Kata/Refactoring-Kata/cpp && $(MAKE) $(MAKESILENT) -f src/CMakeFiles/src.dir/build.make src/CMakeFiles/src.dir/ReceiptPrinter.cpp.s
+.PHONY : ReceiptPrinter.cpp.s
+
+ShoppingCart.o: ShoppingCart.cpp.o
+.PHONY : ShoppingCart.o
+
+# target to build an object file
+ShoppingCart.cpp.o:
+	cd /home/runner/work/Refactoring-Kata/Refactoring-Kata/cpp && $(MAKE) $(MAKESILENT) -f src/CMakeFiles/src.dir/build.make src/CMakeFiles/src.dir/ShoppingCart.cpp.o
+.PHONY : ShoppingCart.cpp.o
+
+ShoppingCart.i: ShoppingCart.cpp.i
+.PHONY : ShoppingCart.i
+
+# target to preprocess a source file
+ShoppingCart.cpp.i:
+	cd /home/runner/work/Refactoring-Kata/Refactoring-Kata/cpp && $(MAKE) $(MAKESILENT) -f src/CMakeFiles/src.dir/build.make src/CMakeFiles/src.dir/ShoppingCart.cpp.i
+.PHONY : ShoppingCart.cpp.i
+
+ShoppingCart.s: ShoppingCart.cpp.s
+.PHONY : ShoppingCart.s
+
+# target to generate assembly for a file
+ShoppingCart.cpp.s:
+	cd /home/runner/work/Refactoring-Kata/Refactoring-Kata/cpp && $(MAKE) $(MAKESILENT) -f src/CMakeFiles/src.dir/build.make src/CMakeFiles/src.dir/ShoppingCart.cpp.s
+.PHONY : ShoppingCart.cpp.s
+
+Teller.o: Teller.cpp.o
+.PHONY : Teller.o
+
+# target to build an object file
+Teller.cpp.o:
+	cd /home/runner/work/Refactoring-Kata/Refactoring-Kata/cpp && $(MAKE) $(MAKESILENT) -f src/CMakeFiles/src.dir/build.make src/CMakeFiles/src.dir/Teller.cpp.o
+.PHONY : Teller.cpp.o
+
+Teller.i: Teller.cpp.i
+.PHONY : Teller.i
+
+# target to preprocess a source file
+Teller.cpp.i:
+	cd /home/runner/work/Refactoring-Kata/Refactoring-Kata/cpp && $(MAKE) $(MAKESILENT) -f src/CMakeFiles/src.dir/build.make src/CMakeFiles/src.dir/Teller.cpp.i
+.PHONY : Teller.cpp.i
+
+Teller.s: Teller.cpp.s
+.PHONY : Teller.s
+
+# target to generate assembly for a file
+Teller.cpp.s:
+	cd /home/runner/work/Refactoring-Kata/Refactoring-Kata/cpp && $(MAKE) $(MAKESILENT) -f src/CMakeFiles/src.dir/build.make src/CMakeFiles/src.dir/Teller.cpp.s
+.PHONY : Teller.cpp.s
+
+# Help Target
+help:
+	@echo "The following are some of the valid targets for this Makefile:"
+	@echo "... all (the default if no target is provided)"
+	@echo "... clean"
+	@echo "... depend"
+	@echo "... edit_cache"
+	@echo "... install"
+	@echo "... install/local"
+	@echo "... install/strip"
+	@echo "... list_install_components"
+	@echo "... rebuild_cache"
+	@echo "... test"
+	@echo "... src"
+	@echo "... Discount.o"
+	@echo "... Discount.i"
+	@echo "... Discount.s"
+	@echo "... FakeCatalog.o"
+	@echo "... FakeCatalog.i"
+	@echo "... FakeCatalog.s"
+	@echo "... Offer.o"
+	@echo "... Offer.i"
+	@echo "... Offer.s"
+	@echo "... Product.o"
+	@echo "... Product.i"
+	@echo "... Product.s"
+	@echo "... ProductQuantity.o"
+	@echo "... ProductQuantity.i"
+	@echo "... ProductQuantity.s"
+	@echo "... Receipt.o"
+	@echo "... Receipt.i"
+	@echo "... Receipt.s"
+	@echo "... ReceiptItem.o"
+	@echo "... ReceiptItem.i"
+	@echo "... ReceiptItem.s"
+	@echo "... ReceiptPrinter.o"
+	@echo "... ReceiptPrinter.i"
+	@echo "... ReceiptPrinter.s"
+	@echo "... ShoppingCart.o"
+	@echo "... ShoppingCart.i"
+	@echo "... ShoppingCart.s"
+	@echo "... Teller.o"
+	@echo "... Teller.i"
+	@echo "... Teller.s"
+.PHONY : help
+
+
+
+#=============================================================================
+# Special targets to cleanup operation of make.
+
+# Special rule to run CMake to check the build system integrity.
+# No rule that depends on this can have commands that come from listfiles
+# because they might be regenerated.
+cmake_check_build_system:
+	cd /home/runner/work/Refactoring-Kata/Refactoring-Kata/cpp && $(CMAKE_COMMAND) -S$(CMAKE_SOURCE_DIR) -B$(CMAKE_BINARY_DIR) --check-build-system CMakeFiles/Makefile.cmake 0
+.PHONY : cmake_check_build_system
+
diff --git a/cpp/src/ReceiptPrinter.h b/cpp/src/ReceiptPrinter.h
index 16c61e4..632c1d9 100644
--- a/cpp/src/ReceiptPrinter.h
+++ b/cpp/src/ReceiptPrinter.h
@@ -9,9 +9,16 @@
 
 class ReceiptPrinter
 {
+private:
+    // Receipt formatting constants
+    static constexpr int DEFAULT_COLUMN_WIDTH = 40;
+    static constexpr int PRICE_DECIMAL_PLACES = 2;
+    static constexpr int WHOLE_QUANTITY_DECIMAL_PLACES = 0;
+    static constexpr int FRACTIONAL_QUANTITY_DECIMAL_PLACES = 3;
+    static constexpr int DEFAULT_ITEM_QUANTITY = 1;
 
 public:
-    ReceiptPrinter() : ReceiptPrinter(40)
+    ReceiptPrinter() : ReceiptPrinter(DEFAULT_COLUMN_WIDTH)
     {
     }
 
@@ -36,14 +43,14 @@ class ReceiptPrinter
 
     std::string presentReceiptItem(const ReceiptItem &item) const
     {
-        std::string price = getFormattedNumberAsString(item.getTotalPrice(), 2);
+        std::string price = getFormattedNumberAsString(item.getTotalPrice(), PRICE_DECIMAL_PLACES);
         std::string name = item.getProduct().getName();
 
         std::string line = formatLineWithWhitespace(name, price);
 
-        if (item.getQuantity() != 1)
+        if (item.getQuantity() != DEFAULT_ITEM_QUANTITY)
         {
-            line += "  " + getFormattedNumberAsString(item.getPrice(), 2) + " * " + presentQuantity(item) + "\n";
+            line += "  " + getFormattedNumberAsString(item.getPrice(), PRICE_DECIMAL_PLACES) + " * " + presentQuantity(item) + "\n";
         }
         return line;
     }
@@ -51,7 +58,7 @@ class ReceiptPrinter
     std::string presentDiscount(const Discount &discount) const
     {
         std::string name = discount.getDescription() + "(" + discount.getProduct().getName() + ")";
-        std::string pricePresentation = getFormattedNumberAsString(discount.getDiscountAmount(), 2);
+        std::string pricePresentation = getFormattedNumberAsString(discount.getDiscountAmount(), PRICE_DECIMAL_PLACES);
         return formatLineWithWhitespace(name, pricePresentation);
     }
 
@@ -74,13 +81,13 @@ class ReceiptPrinter
     }
 
     std::string presentPrice(double price) const
-    { return getFormattedNumberAsString(price, 2); }
+    { return getFormattedNumberAsString(price, PRICE_DECIMAL_PLACES); }
 
     static std::string presentQuantity(const ReceiptItem &item)
     {
         return ProductUnit::Each == item.getProduct().getUnit()
-               ? getFormattedNumberAsString(item.getQuantity(), 0)
-               : getFormattedNumberAsString(item.getQuantity(), 3);
+               ? getFormattedNumberAsString(item.getQuantity(), WHOLE_QUANTITY_DECIMAL_PLACES)
+               : getFormattedNumberAsString(item.getQuantity(), FRACTIONAL_QUANTITY_DECIMAL_PLACES);
     }
 
 private:
diff --git a/cpp/src/cmake_install.cmake b/cpp/src/cmake_install.cmake
new file mode 100644
index 0000000..09531d2
--- /dev/null
+++ b/cpp/src/cmake_install.cmake
@@ -0,0 +1,50 @@
+# Install script for directory: /home/runner/work/Refactoring-Kata/Refactoring-Kata/cpp/src
+
+# Set the install prefix
+if(NOT DEFINED CMAKE_INSTALL_PREFIX)
+  set(CMAKE_INSTALL_PREFIX "/usr/local")
+endif()
+string(REGEX REPLACE "/$" "" CMAKE_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}")
+
+# Set the install configuration name.
+if(NOT DEFINED CMAKE_INSTALL_CONFIG_NAME)
+  if(BUILD_TYPE)
+    string(REGEX REPLACE "^[^A-Za-z0-9_]+" ""
+           CMAKE_INSTALL_CONFIG_NAME "${BUILD_TYPE}")
+  else()
+    set(CMAKE_INSTALL_CONFIG_NAME "")
+  endif()
+  message(STATUS "Install configuration: \"${CMAKE_INSTALL_CONFIG_NAME}\"")
+endif()
+
+# Set the component getting installed.
+if(NOT CMAKE_INSTALL_COMPONENT)
+  if(COMPONENT)
+    message(STATUS "Install component: \"${COMPONENT}\"")
+    set(CMAKE_INSTALL_COMPONENT "${COMPONENT}")
+  else()
+    set(CMAKE_INSTALL_COMPONENT)
+  endif()
+endif()
+
+# Install shared libraries without execute permission?
+if(NOT DEFINED CMAKE_INSTALL_SO_NO_EXE)
+  set(CMAKE_INSTALL_SO_NO_EXE "1")
+endif()
+
+# Is this installation the result of a crosscompile?
+if(NOT DEFINED CMAKE_CROSSCOMPILING)
+  set(CMAKE_CROSSCOMPILING "FALSE")
+endif()
+
+# Set path to fallback-tool for dependency-resolution.
+if(NOT DEFINED CMAKE_OBJDUMP)
+  set(CMAKE_OBJDUMP "/usr/bin/objdump")
+endif()
+
+string(REPLACE ";" "\n" CMAKE_INSTALL_MANIFEST_CONTENT
+       "${CMAKE_INSTALL_MANIFEST_FILES}")
+if(CMAKE_INSTALL_LOCAL_ONLY)
+  file(WRITE "/home/runner/work/Refactoring-Kata/Refactoring-Kata/cpp/src/install_local_manifest.txt"
+     "${CMAKE_INSTALL_MANIFEST_CONTENT}")
+endif()
diff --git a/cpp/src/libsrc.a b/cpp/src/libsrc.a
new file mode 100644
index 0000000..cae0781
Binary files /dev/null and b/cpp/src/libsrc.a differ
diff --git a/elixir/lib/supermarket/model/shopping_cart.ex b/elixir/lib/supermarket/model/shopping_cart.ex
index b0fc089..b91b424 100644
--- a/elixir/lib/supermarket/model/shopping_cart.ex
+++ b/elixir/lib/supermarket/model/shopping_cart.ex
@@ -5,12 +5,23 @@ defmodule Supermarket.Model.ShoppingCart do
   alias Supermarket.Model.Receipt
   alias Supermarket.Model.SupermarketCatalog
 
+  # Special offer quantity constants
+  @two_for_offer_quantity 2
+  @three_for_two_quantity 3
+  @five_for_offer_quantity 5
+
+  # Percentage conversion constant
+  @percentage_divisor 100.0
+
+  # Default item quantity
+  @default_item_quantity 1.0
+
   defstruct [:items, :product_quantities]
 
   def new, do: %__MODULE__{items: [], product_quantities: %{}}
 
   def add_item(cart, product) do
-    add_item_quantity(cart, product, 1.0)
+    add_item_quantity(cart, product, @default_item_quantity)
   end
 
   def add_item_quantity(cart, product, quantity) do
@@ -41,34 +52,34 @@ defmodule Supermarket.Model.ShoppingCart do
         {discount, x} =
           cond do
             offer.offer_type == :three_for_two ->
-              {discount, 3}
+              {discount, @three_for_two_quantity}
 
             offer.offer_type == :two_for_amount ->
-              if quantity_as_int >= 2 do
-                x = 2
+              if quantity_as_int >= @two_for_offer_quantity do
+                x = @two_for_offer_quantity
                 int_division = div(quantity_as_int, x)
                 price_per_unit = offer.argument * int_division
-                the_total = Integer.mod(quantity_as_int, 2) * unit_price
+                the_total = Integer.mod(quantity_as_int, @two_for_offer_quantity) * unit_price
                 total = price_per_unit + the_total
                 discount_n = unit_price * quantity - total
-                {Discount.new(p, "2 for #{offer.argument}", -discount_n), 2}
+                {Discount.new(p, "2 for #{offer.argument}", -discount_n), @two_for_offer_quantity}
               else
                 {discount, x}
               end
 
             true ->
-              {discount, 2}
+              {discount, @two_for_offer_quantity}
           end
 
-        x = if offer.offer_type == :five_for_amount, do: 5, else: x
+        x = if offer.offer_type == :five_for_amount, do: @five_for_offer_quantity, else: x
         number_of_xs = div(quantity_as_int, x)
 
         discount =
           cond do
-            offer.offer_type == :three_for_two and quantity_as_int > 2 ->
+            offer.offer_type == :three_for_two and quantity_as_int > @two_for_offer_quantity ->
               discount_amount =
                 quantity * unit_price -
-                  (number_of_xs * 2 * unit_price + Integer.mod(quantity_as_int, 3) * unit_price)
+                  (number_of_xs * @two_for_offer_quantity * unit_price + Integer.mod(quantity_as_int, @three_for_two_quantity) * unit_price)
 
               Discount.new(p, "3 for 2", -discount_amount)
 
@@ -76,13 +87,13 @@ defmodule Supermarket.Model.ShoppingCart do
               Discount.new(
                 p,
                 "#{offer.argument}% off",
-                -quantity * unit_price * offer.argument / 100.0
+                -quantity * unit_price * offer.argument / @percentage_divisor
               )
 
-            offer.offer_type == :five_for_amount and quantity_as_int >= 5 ->
+            offer.offer_type == :five_for_amount and quantity_as_int >= @five_for_offer_quantity ->
               discount_total =
                 unit_price * quantity -
-                  (offer.argument * number_of_xs + Integer.mod(quantity_as_int, 5) * unit_price)
+                  (offer.argument * number_of_xs + Integer.mod(quantity_as_int, @five_for_offer_quantity) * unit_price)
 
               Discount.new(p, "#{x} for #{offer.argument}", -discount_total)
 
diff --git a/ruby/lib/receipt_printer.rb b/ruby/lib/receipt_printer.rb
index 3c06478..6438439 100644
--- a/ruby/lib/receipt_printer.rb
+++ b/ruby/lib/receipt_printer.rb
@@ -1,21 +1,27 @@
 class ReceiptPrinter
-
-  def initialize(columns = 40)
+  # Receipt formatting constants
+  DEFAULT_COLUMN_WIDTH = 40
+  PRICE_DECIMAL_PLACES = 2
+  FRACTIONAL_QUANTITY_DECIMAL_PLACES = 3
+  DEFAULT_ITEM_QUANTITY = 1
+  DISCOUNT_SPACING_OFFSET = 3
+
+  def initialize(columns = DEFAULT_COLUMN_WIDTH)
     @columns = columns
   end
 
   def print_receipt(receipt)
     result = ""
     for item in receipt.items do
-      price = "%.2f" % item.total_price
+      price = "%.#{PRICE_DECIMAL_PLACES}f" % item.total_price
       quantity = self.class.present_quantity(item)
       name = item.product.name
-      unit_price = "%.2f" % item.price
+      unit_price = "%.#{PRICE_DECIMAL_PLACES}f" % item.price
 
       whitespace_size = @columns - name.size - price.size
       line = name + self.class.whitespace(whitespace_size) + price + "\n"
 
-      if item.quantity != 1
+      if item.quantity != DEFAULT_ITEM_QUANTITY
         line += "  " + unit_price + " * " + quantity + "\n"
       end
 
@@ -23,19 +29,19 @@ def print_receipt(receipt)
     end
     for discount in receipt.discounts do
       product_presentation = discount.product.name
-      price_presentation = "%.2f" % discount.discount_amount
+      price_presentation = "%.#{PRICE_DECIMAL_PLACES}f" % discount.discount_amount
       description = discount.description
       result.concat(description)
       result.concat("(")
       result.concat(product_presentation)
       result.concat(")")
-      result.concat(self.class.whitespace(@columns - 3 - product_presentation.size - description.size - price_presentation.size))
+      result.concat(self.class.whitespace(@columns - DISCOUNT_SPACING_OFFSET - product_presentation.size - description.size - price_presentation.size))
       result.concat("-");
       result.concat(price_presentation);
       result.concat("\n");
     end
     result.concat("\n")
-    price_presentation = "%.2f" % receipt.total_price.to_f
+    price_presentation = "%.#{PRICE_DECIMAL_PLACES}f" % receipt.total_price.to_f
     total = "Total: "
     whitespace = self.class.whitespace(@columns - total.size - price_presentation.size)
     result.concat(total, whitespace, price_presentation)
@@ -43,7 +49,7 @@ def print_receipt(receipt)
   end
 
   def self.present_quantity(item)
-    return ProductUnit::EACH == item.product.unit ? '%x' % item.quantity.to_i : '%.3f' % item.quantity
+    return ProductUnit::EACH == item.product.unit ? '%x' % item.quantity.to_i : "%.#{FRACTIONAL_QUANTITY_DECIMAL_PLACES}f" % item.quantity
   end
 
   def self.whitespace(whitespace_size)
diff --git a/typescript/src/ReceiptPrinter.ts b/typescript/src/ReceiptPrinter.ts
index 3e62566..c2f14bb 100644
--- a/typescript/src/ReceiptPrinter.ts
+++ b/typescript/src/ReceiptPrinter.ts
@@ -3,8 +3,14 @@ import {ReceiptItem} from "./model/ReceiptItem"
 import {Receipt} from "./model/Receipt"
 
 export class ReceiptPrinter {
+    private static readonly DEFAULT_COLUMN_WIDTH = 40;
+    private static readonly PRICE_DECIMAL_PLACES = 2;
+    private static readonly WHOLE_QUANTITY_DECIMAL_PLACES = 0;
+    private static readonly FRACTIONAL_QUANTITY_DECIMAL_PLACES = 3;
+    private static readonly DEFAULT_ITEM_QUANTITY = 1;
+    private static readonly DISCOUNT_SPACING_OFFSET = 3;
 
-    public constructor(private readonly columns: number = 40) {
+    public constructor(private readonly columns: number = ReceiptPrinter.DEFAULT_COLUMN_WIDTH) {
     }
 
     public printReceipt( receipt: Receipt): string {
@@ -18,7 +24,7 @@ export class ReceiptPrinter {
             let whitespaceSize = this.columns - name.length - price.length;
             let line = name + ReceiptPrinter.getWhitespace(whitespaceSize) + price + "\n";
 
-            if (item.quantity != 1) {
+            if (item.quantity != ReceiptPrinter.DEFAULT_ITEM_QUANTITY) {
                 line += "  " + unitPrice + " * " + quantity + "\n";
             }
             result += line;
@@ -31,7 +37,7 @@ export class ReceiptPrinter {
             result += "(";
             result += productPresentation;
             result += ")";
-            result += ReceiptPrinter.getWhitespace(this.columns - 3 - productPresentation.length - description.length - pricePresentation.length);
+            result += ReceiptPrinter.getWhitespace(this.columns - ReceiptPrinter.DISCOUNT_SPACING_OFFSET - productPresentation.length - description.length - pricePresentation.length);
             result += "-";
             result += pricePresentation;
             result += "\n";
@@ -49,16 +55,16 @@ export class ReceiptPrinter {
 
     private format2Decimals(number: number) {
         return new Intl.NumberFormat('en-UK', {
-            minimumFractionDigits: 2,
-            maximumFractionDigits: 2
+            minimumFractionDigits: ReceiptPrinter.PRICE_DECIMAL_PLACES,
+            maximumFractionDigits: ReceiptPrinter.PRICE_DECIMAL_PLACES
         }).format(number)
     }
 
     private static presentQuantity( item: ReceiptItem): string  {
         return ProductUnit.Each == item.product.unit
             // TODO make sure this is the simplest way to make something similar to the java version
-                ? new Intl.NumberFormat('en-UK', {maximumFractionDigits: 0}).format(item.quantity)
-                : new Intl.NumberFormat('en-UK', {minimumFractionDigits: 3}).format(item.quantity);
+                ? new Intl.NumberFormat('en-UK', {maximumFractionDigits: ReceiptPrinter.WHOLE_QUANTITY_DECIMAL_PLACES}).format(item.quantity)
+                : new Intl.NumberFormat('en-UK', {minimumFractionDigits: ReceiptPrinter.FRACTIONAL_QUANTITY_DECIMAL_PLACES}).format(item.quantity);
     }
 
     private static getWhitespace(whitespaceSize: number): string {