* rational.c (nurat_div): divided by float zero should be

infinity.  [ruby-core:31626]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@28886 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Fri Aug  6 20:12:28 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* rational.c (nurat_div): divided by float zero should be
+	  infinity.  [ruby-core:31626]
+
 Fri Aug  6 18:59:23 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* file.c (realpath_rec): rb_str_modify depends on the length, so

rational.c

@@ -882,7 +882,7 @@ nurat_div(VALUE self, VALUE other)
 		    return DBL2NUM(-INFINITY);
 		}
 	    }
-	    if (modf(x, &den) == 0.0) {
+	    if (x != 0.0 && modf(x, &den) == 0.0) {
 		return rb_rational_raw2(dat->num, f_mul(rb_dbl2big(den), dat->den));
 	    }
 	}

test/ruby/test_rational.rb

@@ -297,6 +297,8 @@ class Rational_Test < Test::Unit::TestCase
 
     assert_raise(ZeroDivisionError){Rational(1, 3) / 0}
     assert_raise(ZeroDivisionError){Rational(1, 3) / Rational(0)}
+
+    assert((Rational(1, 3) / 0.0).infinite?, '[ruby-core:31626]')
   end
 
   def assert_eql(exp, act, *args)
@@ -546,6 +548,7 @@ class Rational_Test < Test::Unit::TestCase
 
     assert_equal(0.25, c.fdiv(2))
     assert_equal(0.25, c.fdiv(2.0))
+    assert(c.fdiv(0).infinite?, '[ruby-core:31626]')
   end
 
   def test_expt
@@ -1067,6 +1070,7 @@ class Rational_Test < Test::Unit::TestCase
     assert_equal(Rational(5000000000), 10000000000.quo(2))
     assert_equal(0.5, 1.0.quo(2))
     assert_equal(Rational(1,4), Rational(1,2).quo(2))
+    assert(Rational(1,2).quo(0.0).infinite?, '[ruby-core:31626]')
 
     assert_equal(0.5, 1.fdiv(2))
     assert_equal(5000000000.0, 10000000000.fdiv(2))