test262/test/suite/ch11/11.5/11.5.2/S11.5.2_A4_T6.js

// Copyright 2009 the Sputnik authors.  All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/**
 * The result of division is determined by the specification of IEEE 754 arithmetics
 *
 * @path ch11/11.5/11.5.2/S11.5.2_A4_T6.js
 * @description Division of a finite value by an infinity results in zero of appropriate sign
 */

//CHECK#1
if (1 / Number.NEGATIVE_INFINITY !== -0) {
  $ERROR('#1.1: 1 / -Infinity === 0. Actual: ' + (1 / -Infinity));
} else {
  if (1 / (1 / Number.NEGATIVE_INFINITY) !== Number.NEGATIVE_INFINITY) {
    $ERROR('#1.2: 1 / -Infinity === - 0. Actual: +0');
  }
}

//CHECK#2
if (-1 / Number.NEGATIVE_INFINITY !== +0) {
  $ERROR('#2.1: -1 / -Infinity === 0. Actual: ' + (-1 / -Infinity));
} else {
  if (1 / (-1 / Number.NEGATIVE_INFINITY) !== Number.POSITIVE_INFINITY) {
    $ERROR('#2.2: -1 / -Infinity === + 0. Actual: -0');
  }
}

//CHECK#3
if (1 / Number.POSITIVE_INFINITY !== +0) {
  $ERROR('#3.1: 1 / Infinity === 0. Actual: ' + (1 / Infinity));
} else {
  if (1 / (1 / Number.POSITIVE_INFINITY) !== Number.POSITIVE_INFINITY) {
    $ERROR('#3.2: 1 / Infinity === + 0. Actual: -0');
  }
}

//CHECK#4
if (-1 / Number.POSITIVE_INFINITY !== -0) {
  $ERROR('#4.1: -1 / Infinity === 0. Actual: ' + (-1 / Infinity));
} else {
  if (1 / (-1 / Number.POSITIVE_INFINITY) !== Number.NEGATIVE_INFINITY) {
    $ERROR('#4.2: -1 / Infinity === - 0. Actual: +0');
  }
}