#!/usr/bin/env node;
/******************************************************************************
 * Various trigonometric approximations to Pi.
 * 
 * Copyright © 2017 Richard Lesh.  All rights reserved.
 *****************************************************************************/

const Utils = require('./Utils');

const main = async () => {
    const PI1 = Math.atan(1.0) * 4.0;
    const PI2 = Math.atan2(0.0, -1.0);
    const PI3 = Math.acos(-1.0);
    const PI4 = 2.0 * Math.acos(0.0);

    console.log(Utils.format("pi1: {0:.15f}", PI1));
    console.log(Utils.format("abs(pi1 - π): {0:.10e}", Math.abs(PI1 - Math.PI)));
    console.log(Utils.format("pi2: {0:.15f}", PI2));
    console.log(Utils.format("abs(pi2 - π): {0:.10e}", Math.abs(PI2 - Math.PI)));
    console.log(Utils.format("pi3: {0:.15f}", PI3));
    console.log(Utils.format("abs(pi3 - π): {0:.10e}", Math.abs(PI3 - Math.PI)));
    console.log(Utils.format("pi4: {0:.15f}", PI4));
    console.log(Utils.format("abs(pi4 - π): {0:.10e}", Math.abs(PI4 - Math.PI)));
}
main().catch( e => { console.error(e) } );