numeric.c: flo_floor

* numeric.c (flo_floor): add an optional parameter, digits, as
  well as Integer#floor.  [Feature #12245]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54563 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 22 insertions, 0 deletions

diff --git a/test/ruby/test_float.rb b/test/ruby/test_float.rb
index aeac359081..9deed4dea4 100644
--- a/test/ruby/test_float.rb
+++ b/test/ruby/test_float.rb
@@ -444,6 +444,28 @@ class TestFloat < Test::Unit::TestCase
     assert_equal(1.0, 0.998.round(prec))
   end
 
+  def test_floor_with_precision
+    assert_equal(1.100, 1.111.floor(1))
+    assert_equal(1.110, 1.111.floor(2))
+    assert_equal(11110, 11119.9.floor(-1))
+    assert_equal(11100, 11100.0.floor(-2))
+    assert_equal(11100, 11199.9.floor(-2))
+    assert_equal(0, 11111.1.floor(-5))
+
+    assert_equal(10**300, 1.1e300.floor(-300))
+    assert_equal(-2*10**300, -1.1e300.floor(-300))
+    assert_equal(1.0e-300, 1.1e-300.floor(300))
+    assert_equal(-2.0e-300, -1.1e-300.floor(300))
+
+    assert_equal(42.0, 42.0.floor(308))
+    assert_equal(1.0e307, 1.0e307.floor(2))
+
+    assert_raise(TypeError) {1.0.floor("4")}
+    assert_raise(TypeError) {1.0.floor(nil)}
+    def (prec = Object.new).to_int; 2; end
+    assert_equal(0.99, 0.998.floor(prec))
+  end
+
   VS = [
     18446744073709551617.0,
     18446744073709551616.0,