ceil/floor/truncate/round return integers.

sdk/lib/core/int.dart

 // Copyright (c) 2012, 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.
 
 part of dart.core;
 
 /**
  * Representation of Dart integers containing integer specific
  * operations and specialization of operations inherited from [num].
  *
@@ skipping 31 matching lines @@
 
   /** Returns true if and only if this integer is odd. */
   bool get isOdd;
 
   /** Negate operator. Negating an integer produces an integer. */
   int operator -();
 
   /** Returns the absolute value of this integer. */
   int abs();
 
-  /** Returns [this]. */
+  /** Returns `this`. */
   int round();
 
-  /** Returns [this]. */
+  /** Returns `this`. */
   int floor();
 
   /** Returns [this]. */
   int ceil();
 
   /** Returns [this]. */
   int truncate();
 
+  /** Returns `this.toDouble()`. */
+  double roundToDouble();
+
+  /** Returns `this.toDouble()`. */
+  double floorToDouble();
+
+  /** Returns `this.toDouble()`. */
+  double ceilToDouble();
+
+  /** Returns `this.toDouble()`. */
+  double truncateToDouble();
+
   /**
    * Returns a representation of this [int] value.
    *
    * It should always be the case that if [:i:] is an [int] value,
    * then [:i == int.parse(i.toString()):].
    */
   String toString();
 
   /**
    * Converts [this] to a string representation in the given [radix].
@@ skipping 23 matching lines @@
    *
    * If the [source] is not a valid integer literal, optionally prefixed by a
    * sign, the [onError] is called with the [source] as argument, and its return
    * value is used instead. If no [onError] is provided, a [FormatException]
    * is thrown.
    */
   external static int parse(String source,
                             { int radix,
                               int onError(String source) });
 }