Add koans for floats, rename to numbers koans, reposition on the list

lib/koans/04_numbers.ex

@@ -0,0 +1,72 @@
+defmodule Numbers do
+  require Integer
+  use Koans
+
+  @intro "Numbers"
+
+  koan "Are you odd?" do
+    assert Integer.is_odd(3) == ___
+  end
+
+  koan "Actually you might be even" do
+    assert Integer.is_even(4) == ___
+  end
+
+  koan "Let's grab the individual digits in a list" do 
+    individual_digits = Integer.digits(58127)
+    assert individual_digits == ___
+  end
+
+  koan "Oh no! I need it back together" do 
+    number = Integer.undigits([1, 2, 3, 4])
+
+    assert number == ___
+  end
+
+  koan "I think I need my number as a char" do 
+    char_digit = Integer.to_char_list(7)
+
+    assert char_digit == ___
+  end
+
+  koan "Actually I want my number as a string" do 
+    string_digit = Integer.to_string(1234)
+
+    assert string_digit == ___
+  end
+
+  koan "The meaning of life in hexidecimal is 2A!" do
+    assert Integer.parse("2A", 16) == {___, ""}
+  end
+
+  koan "I don't want this decimal point, let's round up" do
+    assert Float.ceil(34.25) == ___
+  end
+
+  koan "OK, I only want it to 1 decimal place" do
+    assert Float.ceil(34.25, 1) == ___
+  end
+
+  koan "Rounding down is what I need" do
+    assert Float.floor(99.99) == ___
+  end
+
+  koan "Rounding down to 2 decimal places" do
+    assert Float.floor(12.345, 2) == ___
+  end
+
+  koan "Just want to parse to a float" do
+    assert Float.parse("34.5") == {___, ""}
+  end
+
+  koan "Hmm, I want to parse this but it has some strings" do
+    assert Float.parse("1 million dollars") == {___, " million dollars"}
+  end
+
+  koan "Round the number up or down for me" do
+    assert Float.round(5.5) == ___
+    assert Float.round(5.4) == ___
+    assert Float.round(8.94, 1) == ___
+    assert Float.round(-5.5674, 3) == ___
+  end
+end

lib/koans/16_integers.ex

@@ -1,41 +0,0 @@
-defmodule Integers do
-  require Integer
-  use Koans
-
-  @intro "Integers"
-
-  koan "Are you odd?" do
-    assert Integer.is_odd(3) == ___
-  end
-
-  koan "Actually you might be even" do
-    assert Integer.is_even(4) == ___
-  end
-
-  koan "Let's grab the individual digits in a list" do 
-    individual_digits = Integer.digits(58127)
-    assert individual_digits == ___
-  end
-
-  koan "Oh no! I need it back together" do 
-    number = Integer.undigits([1, 2, 3, 4])
-
-    assert number == ___
-  end
-
-  koan "I think I need my number as a char" do 
-    char_digit = Integer.to_char_list(7)
-
-    assert char_digit == ___
-  end
-
-  koan "Actually I want my number as a string" do 
-    string_digit = Integer.to_string(1234)
-
-    assert string_digit == ___
-  end
-
-  koan "The meaning of life in hexidecimal is 2A!" do
-    assert Integer.parse("2A", 16) == {___, ""}
-  end
-end