ceil/floor/truncate/round return integers.

tests/corelib/double_floor_to_double_test.dart

+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+main() {
+  Expect.equals(0.0, 0.0.floorToDouble());
+  Expect.equals(0.0, double.MIN_POSITIVE.floorToDouble());
+  Expect.equals(0.0, (2.0 * double.MIN_POSITIVE).floorToDouble());
+  Expect.equals(0.0, (1.18e-38).floorToDouble());
+  Expect.equals(0.0, (1.18e-38 * 2).floorToDouble());
+  Expect.equals(0.0, 0.49999999999999994.floorToDouble());
+  Expect.equals(0.0, 0.5.floorToDouble());
+  Expect.equals(0.0, 0.9999999999999999.floorToDouble());
+  Expect.equals(1.0, 1.0.floorToDouble());
+  Expect.equals(1.0, 1.000000000000001.floorToDouble());
+  // The following numbers are on the border of 52 bits.
+  // For example: 4503599627370499 + 0.5 => 4503599627370500.
+  Expect.equals(4503599627370496.0, 4503599627370496.0.floorToDouble());
+  Expect.equals(4503599627370497.0, 4503599627370497.0.floorToDouble());
+  Expect.equals(4503599627370498.0, 4503599627370498.0.floorToDouble());
+  Expect.equals(4503599627370499.0, 4503599627370499.0.floorToDouble());
+
+  Expect.equals(9007199254740991.0, 9007199254740991.0.floorToDouble());
+  Expect.equals(9007199254740992.0, 9007199254740992.0.floorToDouble());
+  Expect.equals(double.MAX_FINITE, double.MAX_FINITE.floorToDouble());
+
+  Expect.equals(-1.0, (-double.MIN_POSITIVE).floorToDouble());
+  Expect.equals(-1.0, (2.0 * -double.MIN_POSITIVE).floorToDouble());
+  Expect.equals(-1.0, (-1.18e-38).floorToDouble());
+  Expect.equals(-1.0, (-1.18e-38 * 2).floorToDouble());
+  Expect.equals(-1.0, (-0.49999999999999994).floorToDouble());
+  Expect.equals(-1.0, (-0.5).floorToDouble());
+  Expect.equals(-1.0, (-0.9999999999999999).floorToDouble());
+  Expect.equals(-1.0, (-1.0).floorToDouble());
+  Expect.equals(-2.0, (-1.000000000000001).floorToDouble());
+  Expect.equals(-4503599627370496.0, (-4503599627370496.0).floorToDouble());
+  Expect.equals(-4503599627370497.0, (-4503599627370497.0).floorToDouble());
+  Expect.equals(-4503599627370498.0, (-4503599627370498.0).floorToDouble());
+  Expect.equals(-4503599627370499.0, (-4503599627370499.0).floorToDouble());
+  Expect.equals(-9007199254740991.0, (-9007199254740991.0).floorToDouble());
+  Expect.equals(-9007199254740992.0, (-9007199254740992.0).floorToDouble());
+  Expect.equals(-double.MAX_FINITE, (-double.MAX_FINITE).floorToDouble());
+
+  Expect.equals(double.INFINITY, double.INFINITY.floorToDouble());
+  Expect.equals(double.NEGATIVE_INFINITY,
+                double.NEGATIVE_INFINITY.floorToDouble());
+  Expect.isTrue(double.NAN.floorToDouble().isNaN);
+
+  Expect.isTrue(0.0.floorToDouble() is double);
+  Expect.isTrue(double.MIN_POSITIVE.floorToDouble() is double);
+  Expect.isTrue((2.0 * double.MIN_POSITIVE).floorToDouble() is double);
+  Expect.isTrue((1.18e-38).floorToDouble() is double);
+  Expect.isTrue((1.18e-38 * 2).floorToDouble() is double);
+  Expect.isTrue(0.49999999999999994.floorToDouble() is double);
+  Expect.isTrue(0.5.floorToDouble() is double);
+  Expect.isTrue(0.9999999999999999.floorToDouble() is double);
+  Expect.isTrue(1.0.floorToDouble() is double);
+  Expect.isTrue(1.000000000000001.floorToDouble() is double);
+  Expect.isTrue(4503599627370496.0.floorToDouble() is double);
+  Expect.isTrue(4503599627370497.0.floorToDouble() is double);
+  Expect.isTrue(4503599627370498.0.floorToDouble() is double);
+  Expect.isTrue(4503599627370499.0.floorToDouble() is double);
+  Expect.isTrue(9007199254740991.0.floorToDouble() is double);
+  Expect.isTrue(9007199254740992.0.floorToDouble() is double);
+  Expect.isTrue(double.MAX_FINITE.floorToDouble() is double);
+
+  Expect.isTrue((-double.MIN_POSITIVE).floorToDouble() is double);
+  Expect.isTrue((2.0 * -double.MIN_POSITIVE).floorToDouble() is double);
+  Expect.isTrue((-1.18e-38).floorToDouble() is double);
+  Expect.isTrue((-1.18e-38 * 2).floorToDouble() is double);
+  Expect.isTrue((-0.49999999999999994).floorToDouble() is double);
+  Expect.isTrue((-0.5).floorToDouble() is double);
+  Expect.isTrue((-0.9999999999999999).floorToDouble() is double);
+  Expect.isTrue((-1.0).floorToDouble() is double);
+  Expect.isTrue((-1.000000000000001).floorToDouble() is double);
+  Expect.isTrue((-4503599627370496.0).floorToDouble() is double);
+  Expect.isTrue((-4503599627370497.0).floorToDouble() is double);
+  Expect.isTrue((-4503599627370498.0).floorToDouble() is double);
+  Expect.isTrue((-4503599627370499.0).floorToDouble() is double);
+  Expect.isTrue((-9007199254740991.0).floorToDouble() is double);
+  Expect.isTrue((-9007199254740992.0).floorToDouble() is double);
+  Expect.isTrue((-double.MAX_FINITE).floorToDouble() is double);
+}