3 files changed, 23 insertions, 1 deletions
diff --git a/mrbgems/mruby-numeric-ext/mrblib/numeric_ext.rb b/mrbgems/mruby-numeric-ext/mrblib/numeric_ext.rb
index dfc6ba87c..0bf3c6ab6 100644
--- a/mrbgems/mruby-numeric-ext/mrblib/numeric_ext.rb
+++ b/mrbgems/mruby-numeric-ext/mrblib/numeric_ext.rb
@@ -2,4 +2,16 @@ module Integral
   def div(other)
     self.divmod(other)[0]
   end
+
+  def zero?
+    self == 0
+  end
+
+  def nonzero?
+    if self == 0
+      nil
+    else
+      self
+    end
+  end
 end
diff --git a/mrbgems/mruby-numeric-ext/src/numeric_ext.c b/mrbgems/mruby-numeric-ext/src/numeric_ext.c
index 22c1668fa..f71236a32 100644
--- a/mrbgems/mruby-numeric-ext/src/numeric_ext.c
+++ b/mrbgems/mruby-numeric-ext/src/numeric_ext.c
@@ -1,5 +1,5 @@
 #include <limits.h>
-#include "mruby.h"
+#include <mruby.h>
 
 static mrb_value
 mrb_int_chr(mrb_state *mrb, mrb_value x)
diff --git a/mrbgems/mruby-numeric-ext/test/numeric.rb b/mrbgems/mruby-numeric-ext/test/numeric.rb
index 96644da69..8bead2489 100644
--- a/mrbgems/mruby-numeric-ext/test/numeric.rb
+++ b/mrbgems/mruby-numeric-ext/test/numeric.rb
@@ -16,3 +16,13 @@ end
 assert('Float#div') do
   assert_float 52, 365.2425.div(7)
 end
+
+assert('Integer#zero?') do
+  assert_equal true, 0.zero?
+  assert_equal false, 1.zero?
+end
+
+assert('Integer#nonzero?') do
+  assert_equal nil, 0.nonzero?
+  assert_equal 1000, 1000.nonzero?
+end