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155 строки
10 KiB
JavaScript
155 строки
10 KiB
JavaScript
/* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is Mozilla Communicator client code, released March
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* 31, 1998.
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*
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* The Initial Developer of the Original Code is Netscape Communications
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* Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*
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*/
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/**
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File Name: 11.5.2.js
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ECMA Section: 11.5.2 Applying the / operator
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Description:
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The / operator performs division, producing the quotient of its operands.
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The left operand is the dividend and the right operand is the divisor.
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ECMAScript does not perform integer division. The operands and result of all
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division operations are double-precision floating-point numbers.
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The result of division is determined by the specification of IEEE 754 arithmetic:
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If either operand is NaN, the result is NaN.
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The sign of the result is positive if both operands have the same sign, negative if the operands have different
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signs.
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Division of an infinity by an infinity results in NaN.
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Division of an infinity by a zero results in an infinity. The sign is determined by the rule already stated above.
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Division of an infinity by a non-zero finite value results in a signed infinity. The sign is determined by the rule
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already stated above.
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Division of a finite value by an infinity results in zero. The sign is determined by the rule already stated above.
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Division of a zero by a zero results in NaN; division of zero by any other finite value results in zero, with the sign
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determined by the rule already stated above.
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Division of a non-zero finite value by a zero results in a signed infinity. The sign is determined by the rule
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already stated above.
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In the remaining cases, where neither an infinity, nor a zero, nor NaN is involved, the quotient is computed and
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rounded to the nearest representable value using IEEE 754 round-to-nearest mode. If the magnitude is too
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large to represent, we say the operation overflows; the result is then an infinity of appropriate sign. If the
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magnitude is too small to represent, we say the operation underflows and the result is a zero of the appropriate
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sign. The ECMAScript language requires support of gradual underflow as defined by IEEE 754.
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Author: christine@netscape.com
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Date: 12 november 1997
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*/
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var SECTION = "11.5.2";
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var VERSION = "ECMA_1";
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startTest();
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var testcases = getTestCases();
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var BUGNUMBER="111202";
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writeHeaderToLog( SECTION + " Applying the / operator");
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test();
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function test() {
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for ( tc=0; tc < testcases.length; tc++ ) {
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testcases[tc].passed = writeTestCaseResult(
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testcases[tc].expect,
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testcases[tc].actual,
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testcases[tc].description +" = "+
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testcases[tc].actual );
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testcases[tc].reason += ( testcases[tc].passed ) ? "" : "wrong value ";
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}
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stopTest();
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return ( testcases );
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}
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function getTestCases() {
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var array = new Array();
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var item = 0;
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// if either operand is NaN, the result is NaN.
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array[item++] = new TestCase( SECTION, "Number.NaN / Number.NaN", Number.NaN, Number.NaN / Number.NaN );
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array[item++] = new TestCase( SECTION, "Number.NaN / 1", Number.NaN, Number.NaN / 1 );
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array[item++] = new TestCase( SECTION, "1 / Number.NaN", Number.NaN, 1 / Number.NaN );
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array[item++] = new TestCase( SECTION, "Number.POSITIVE_INFINITY / Number.NaN", Number.NaN, Number.POSITIVE_INFINITY / Number.NaN );
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array[item++] = new TestCase( SECTION, "Number.NEGATIVE_INFINITY / Number.NaN", Number.NaN, Number.NEGATIVE_INFINITY / Number.NaN );
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// Division of an infinity by an infinity results in NaN.
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array[item++] = new TestCase( SECTION, "Number.NEGATIVE_INFINITY / Number.NEGATIVE_INFINITY", Number.NaN, Number.NEGATIVE_INFINITY / Number.NEGATIVE_INFINITY );
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array[item++] = new TestCase( SECTION, "Number.POSITIVE_INFINITY / Number.NEGATIVE_INFINITY", Number.NaN, Number.POSITIVE_INFINITY / Number.NEGATIVE_INFINITY );
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array[item++] = new TestCase( SECTION, "Number.NEGATIVE_INFINITY / Number.POSITIVE_INFINITY", Number.NaN, Number.NEGATIVE_INFINITY / Number.POSITIVE_INFINITY );
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array[item++] = new TestCase( SECTION, "Number.POSITIVE_INFINITY / Number.POSITIVE_INFINITY", Number.NaN, Number.POSITIVE_INFINITY / Number.POSITIVE_INFINITY );
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// Division of an infinity by a zero results in an infinity.
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array[item++] = new TestCase( SECTION, "Number.POSITIVE_INFINITY / 0", Number.POSITIVE_INFINITY, Number.POSITIVE_INFINITY / 0 );
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array[item++] = new TestCase( SECTION, "Number.NEGATIVE_INFINITY / 0", Number.NEGATIVE_INFINITY, Number.NEGATIVE_INFINITY / 0 );
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array[item++] = new TestCase( SECTION, "Number.POSITIVE_INFINITY / -0", Number.NEGATIVE_INFINITY, Number.POSITIVE_INFINITY / -0 );
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array[item++] = new TestCase( SECTION, "Number.NEGATIVE_INFINITY / -0", Number.POSITIVE_INFINITY, Number.NEGATIVE_INFINITY / -0 );
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// Division of an infinity by a non-zero finite value results in a signed infinity.
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array[item++] = new TestCase( SECTION, "Number.NEGATIVE_INFINITY / 1 ", Number.NEGATIVE_INFINITY, Number.NEGATIVE_INFINITY / 1 );
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array[item++] = new TestCase( SECTION, "Number.NEGATIVE_INFINITY / -1 ", Number.POSITIVE_INFINITY, Number.NEGATIVE_INFINITY / -1 );
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array[item++] = new TestCase( SECTION, "Number.POSITIVE_INFINITY / 1 ", Number.POSITIVE_INFINITY, Number.POSITIVE_INFINITY / 1 );
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array[item++] = new TestCase( SECTION, "Number.POSITIVE_INFINITY / -1 ", Number.NEGATIVE_INFINITY, Number.POSITIVE_INFINITY / -1 );
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array[item++] = new TestCase( SECTION, "Number.NEGATIVE_INFINITY / Number.MAX_VALUE ", Number.NEGATIVE_INFINITY, Number.NEGATIVE_INFINITY / Number.MAX_VALUE );
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array[item++] = new TestCase( SECTION, "Number.NEGATIVE_INFINITY / -Number.MAX_VALUE ", Number.POSITIVE_INFINITY, Number.NEGATIVE_INFINITY / -Number.MAX_VALUE );
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array[item++] = new TestCase( SECTION, "Number.POSITIVE_INFINITY / Number.MAX_VALUE ", Number.POSITIVE_INFINITY, Number.POSITIVE_INFINITY / Number.MAX_VALUE );
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array[item++] = new TestCase( SECTION, "Number.POSITIVE_INFINITY / -Number.MAX_VALUE ", Number.NEGATIVE_INFINITY, Number.POSITIVE_INFINITY / -Number.MAX_VALUE );
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// Division of a finite value by an infinity results in zero.
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array[item++] = new TestCase( SECTION, "1 / Number.NEGATIVE_INFINITY", -0, 1 / Number.NEGATIVE_INFINITY );
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array[item++] = new TestCase( SECTION, "1 / Number.POSITIVE_INFINITY", 0, 1 / Number.POSITIVE_INFINITY );
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array[item++] = new TestCase( SECTION, "-1 / Number.POSITIVE_INFINITY", -0, -1 / Number.POSITIVE_INFINITY );
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array[item++] = new TestCase( SECTION, "-1 / Number.NEGATIVE_INFINITY", 0, -1 / Number.NEGATIVE_INFINITY );
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array[item++] = new TestCase( SECTION, "Number.MAX_VALUE / Number.NEGATIVE_INFINITY", -0, Number.MAX_VALUE / Number.NEGATIVE_INFINITY );
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array[item++] = new TestCase( SECTION, "Number.MAX_VALUE / Number.POSITIVE_INFINITY", 0, Number.MAX_VALUE / Number.POSITIVE_INFINITY );
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array[item++] = new TestCase( SECTION, "-Number.MAX_VALUE / Number.POSITIVE_INFINITY", -0, -Number.MAX_VALUE / Number.POSITIVE_INFINITY );
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array[item++] = new TestCase( SECTION, "-Number.MAX_VALUE / Number.NEGATIVE_INFINITY", 0, -Number.MAX_VALUE / Number.NEGATIVE_INFINITY );
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// Division of a zero by a zero results in NaN
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array[item++] = new TestCase( SECTION, "0 / -0", Number.NaN, 0 / -0 );
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array[item++] = new TestCase( SECTION, "-0 / 0", Number.NaN, -0 / 0 );
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array[item++] = new TestCase( SECTION, "-0 / -0", Number.NaN, -0 / -0 );
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array[item++] = new TestCase( SECTION, "0 / 0", Number.NaN, 0 / 0 );
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// division of zero by any other finite value results in zero
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array[item++] = new TestCase( SECTION, "0 / 1", 0, 0 / 1 );
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array[item++] = new TestCase( SECTION, "0 / -1", -0, 0 / -1 );
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array[item++] = new TestCase( SECTION, "-0 / 1", -0, -0 / 1 );
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array[item++] = new TestCase( SECTION, "-0 / -1", 0, -0 / -1 );
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// Division of a non-zero finite value by a zero results in a signed infinity.
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array[item++] = new TestCase( SECTION, "1 / 0", Number.POSITIVE_INFINITY, 1/0 );
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array[item++] = new TestCase( SECTION, "1 / -0", Number.NEGATIVE_INFINITY, 1/-0 );
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array[item++] = new TestCase( SECTION, "-1 / 0", Number.NEGATIVE_INFINITY, -1/0 );
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array[item++] = new TestCase( SECTION, "-1 / -0", Number.POSITIVE_INFINITY, -1/-0 );
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array[item++] = new TestCase( SECTION, "0 / Number.POSITIVE_INFINITY", 0, 0 / Number.POSITIVE_INFINITY );
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array[item++] = new TestCase( SECTION, "0 / Number.NEGATIVE_INFINITY", -0, 0 / Number.NEGATIVE_INFINITY );
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array[item++] = new TestCase( SECTION, "-0 / Number.POSITIVE_INFINITY", -0, -0 / Number.POSITIVE_INFINITY );
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array[item++] = new TestCase( SECTION, "-0 / Number.NEGATIVE_INFINITY", 0, -0 / Number.NEGATIVE_INFINITY );
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return ( array );
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}
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