/**
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* taylor-serie-exp.js
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*
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*/
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import {terminal} from "./dfhi.js";
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window.main = function(...argv) {
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//const x = Number.parseFloat(argv[0]);
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//const x_rad = x * Math.PI / 180;
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const alpha = [0, 30, 45, 60, 90];
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alpha.map(x => x*Math.PI/180).forEach( a => {
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makeTest("Sinus", a, sin, Math.sin);
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makeTest("Cosinus", a, cos, Math.cos);
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});
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};
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function makeTest(testName, value, impl, ref) {
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const result = impl(value);
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const expected = ref(value);
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terminal.print(`${testName} result: ${result} expected : ${expected}\n`);
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}
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function sin(x) {
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let sum = x;
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let term = -(x**3 / 6);
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const xsqr = x*x;
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let g = 1;
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for(let i = 4; sum + term !== sum; i+=2) {
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sum = sum + term;
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g = i*i + i;
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term = - term * (xsqr/g);
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}
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return sum;
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}
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function cos(x) {
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let sum = 1;
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const xsqr = x*x;
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let g = 2;
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let term = -1 * (xsqr / g);
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for(let i = 3; sum + term !== sum; i+=2) {
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sum = sum + term;
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g = i*i + i;
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term = -1 * term * (xsqr/g);
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}
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return sum;
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}
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