New order for koans

Equalities
Arithmetic
Strings
Tuples
Lists
Maps
Structs
PatternMatching
Functions
Enums
Processes
Tasks

lib/koans/02_arithmetic.ex

@@ -0,0 +1,52 @@
+defmodule Arithmetic do
+  use Koans
+
+  koan "it can add numbers" do
+    assert 3 + :__ == 7
+  end
+
+  koan "it can substract numbers" do
+    assert 7 - 4 == :__
+  end
+
+  koan "it can multiply" do
+    assert 3 * 4 == :__
+  end
+
+  koan "floats and integers can be equal..." do
+    assert 3.0 == :__
+  end
+
+  koan "..unless they are not precisely the same" do
+    assert 3.2 != :__
+  end
+
+  koan "it does floating point division" do
+    assert 5 / 2 == :__
+  end
+
+  koan "it does integer division" do
+    numerator = 5
+    denominator = 2
+    assert div(numerator, denominator) == :__
+  end
+
+  koan "it calculates the remainder of a division" do
+    numerator = 5
+    denominator = 2
+    assert rem(numerator, denominator) == :__
+  end
+
+  koan "it finds the maximum in a list" do
+    assert Enum.max([1,2,3,4]) == :__
+  end
+
+  koan "it finds the minimum in a list" do
+    assert Enum.min([1,2,3,4]) == :__
+  end
+
+  koan "it can compare numbers" do
+    assert 5 > :__
+  end
+
+end