mirror of https://github.com/tc39/test262.git
49 lines
1.2 KiB
JavaScript
49 lines
1.2 KiB
JavaScript
// Copyright 2009 the Sputnik authors. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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info: Sine is a periodic function with period 2*PI
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es5id: 15.8.2.16_A6
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description: >
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Checking if Math.sin(x) equals to Math.sin(x+n*2*Math.PI) with
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precision 0.000000000003, where n is an integer from 1 to 100 and
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x is one of 10 float point values from 0 to 2*Math.PI
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includes: [$FAIL.js]
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---*/
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// CHECK#1
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prec = 0.000000000003;
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//prec = 0.000000000000001;
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period = 2*Math.PI;
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pernum = 100;
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a = -pernum * period;
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b = pernum * period;
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snum = 9;
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step = period/snum + 0.0;
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x = new Array();
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for (i = 0; i < snum; i++)
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{
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x[i] = a + i*step;
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}
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x[9] = a + period;
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var curval;
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var curx;
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var j;
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for (i = 0; i < snum; i++)
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{
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curval = Math.sin(x[i]);
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curx = x[i] + period;
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j = 0;
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while (curx <= b)
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{
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curx += period;
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j++;
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if (Math.abs(Math.sin(curx) - curval) >= prec)
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{
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$FAIL("#1: sin is found out to not be periodic:\n Math.abs(Math.sin(" + x[i] + ") - Math.sin(" + x[i] + " + 2*Math.PI*" + j + ")) >= " + prec + "\n Math.sin(" + x[i] + ") === " + curval + "\n Math.sin(" + curx + ") === " + Math.sin(curx));
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}
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}
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}
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