* numeric.c (ruby_float_step): improve floating point calculations.

  [ruby-core:35753] [Bug #4576]

* numeric.c (ruby_float_step): correct the error of floating point
  numbers on the excluding case.
  patched by Masahiro Tanaka [ruby-core:39608]

* numeric.c (ruby_float_step): use the end value when the current
  value is greater than or equal to the end value.
  patched by Akira Tanaka [ruby-core:39612]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@33407 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 31 insertions, 0 deletions

diff --git a/test/ruby/test_float.rb b/test/ruby/test_float.rb
index e77b9e62e0..531ff04fd6 100644
--- a/test/ruby/test_float.rb
+++ b/test/ruby/test_float.rb
@@ -508,4 +508,35 @@ class TestFloat < Test::Unit::TestCase
       sleep(0.1+0.1+0.1+0.1+0.1+0.1+0.1+0.1+0.1+0.1)
     end
   end
+
+  def test_step
+    1000.times do
+      a = rand
+      b = a+rand*1000
+      s = (b - a) / 10
+      assert_equal(11, (a..b).step(s).to_a.length)
+    end
+
+    assert_equal(11, (1.0..(1.0+1E-15)).step(1E-16).to_a.length)
+
+    (1.0..12.7).step(1.3).each do |n|
+      assert_operator(n, :<=, 12.7)
+    end
+  end
+
+  def test_step_excl
+    1000.times do
+      a = rand
+      b = a+rand*1000
+      s = (b - a) / 10
+      assert_equal(10, (a...b).step(s).to_a.length)
+    end
+
+    assert_equal([1.0, 2.9, 4.8, 6.699999999999999], (1.0...6.8).step(1.9).to_a)
+
+    e = 1+1E-12
+    (1.0 ... e).step(1E-16) do |n|
+      assert_operator(n, :<, e)
+    end
+  end
 end