mirror of https://github.com/tc39/test262.git
47 lines
1.3 KiB
JavaScript
47 lines
1.3 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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* Tangent is a periodic function with period PI
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*
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* @path 15_Native/15.8_The_Math_Object/15.8.2_Function_Properties_of_the_Math_Object/15.8.2.18_tan/S15.8.2.18_A6.js
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* @description Checking if Math.tan(x) equals to Math.tan(x+n*Math.PI) with precision 0.000000000003, where n is an integer from 1 to 100 and x is one of 10 float point values from 0 to Math.PI
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*/
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// CHECK#1
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prec = 0.00000000003;
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//prec = 0.000000000000001;
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period = Math.PI;
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pernum = 100;
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a = -pernum * period + period/2;
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b = pernum * period - period/2;
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snum = 9;
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step = period/(snum + 2);
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x = new Array();
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for (i = 0; i <= snum; i++) //// We exlude special points
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{ //// in this cycle.
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x[i] = a + (i+1)*step; ////
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} ////
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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.tan(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.tan(curx) - curval) >= prec)
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{
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$FAIL("#1: tan is found out to not be periodic:\n Math.abs(Math.tan(" + x[i] + ") - Math.tan(" + x[i] + " + 2*Math.PI*" + j + ")) >= " + prec + "\n Math.tan(" + x[i] + ") === " + curval + "\n Math.tan(" + curx + ") === " + Math.tan(curx));
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}
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}
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}
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