LibTest/core/int/operator_remainder_A01_t02.dart

// Copyright (c) 2011, 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.

/// @assertion num operator %(num other) 
/// The % operator yields the remainder of its operands from an implied division;
/// the left operand is the dividend and the right operand is the divisor.
/// @description Checks that this operator returns correct value for double
/// arguments (including special values) and that it is double.
/// @author rodionov

import "../../../Utils/expect.dart";
import "dart:math" as Math;

main() {
  check(0.0, 1, 0.5);
  check(0.0, 1, -0.5);

  check(0.25, 1, 0.375);
  check(0.25, 1, -0.375);
  check(0.125, -1, 0.375);
  check(0.125, -1, -0.375);

  final double MIN_DOUBLE = Math.pow(2.0, -1074) as double;
  final double NEG_MIN_DOUBLE = -1 * MIN_DOUBLE; 
  final double MAX_DOUBLE =
      (2 - Math.pow(2.0, -52)) * Math.pow(2.0, 1023) as double;
  final double NEG_MAX_DOUBLE = -1 * MAX_DOUBLE; 

  check(0, 0, MIN_DOUBLE);
  check(0, 0, NEG_MIN_DOUBLE);
  check(0, 0, MAX_DOUBLE);
  check(0, 0, NEG_MAX_DOUBLE);
  check(1, 1, MAX_DOUBLE);
  check(1, 1, NEG_MAX_DOUBLE);
  check(1, 1, double.infinity);
  check(double.infinity, -1, double.infinity);
  check(1, 1, double.negativeInfinity);
  check(double.infinity, -1, double.negativeInfinity);
  check(0x1000000000000000, 0x1000000000000000, double.infinity);
  check(double.infinity, -0x1000000000000000, double.infinity);
  check(0x1000000000000000, 0x1000000000000000,
      double.negativeInfinity);
  check(double.infinity, -0x1000000000000000, double.negativeInfinity);
  
  Expect.isTrue((1 % double.nan).isNaN);
  Expect.isTrue((0x1000000000000000 % double.nan).isNaN);
  Expect.isTrue(((-0x1000000000000000) % double.nan).isNaN);
}

void check(num ex, int a, double b) {
  Expect.equals(ex, a % b);
  Expect.isTrue((a % b) is double);
  Expect.runtimeIsType<double>((a % b));
}