43 lines
1.4 KiB
JavaScript
43 lines
1.4 KiB
JavaScript
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// BigNumbers
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// load math.js (using node.js)
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var math = require('../index');
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// configure the default type of numbers as BigNumbers
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math.config({
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number: 'BigNumber', // Default type of number:
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// 'number' (default), 'BigNumber', or 'Fraction'
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precision: 20 // Number of significant digits for BigNumbers
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});
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console.log('round-off errors with numbers');
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print(math.add(0.1, 0.2)); // number, 0.30000000000000004
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print(math.divide(0.3, 0.2)); // number, 1.4999999999999998
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console.log();
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console.log('no round-off errors with BigNumbers');
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print(math.add(math.bignumber(0.1), math.bignumber(0.2))); // BigNumber, 0.3
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print(math.divide(math.bignumber(0.3), math.bignumber(0.2))); // BigNumber, 1.5
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console.log();
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console.log('create BigNumbers from strings when exceeding the range of a number');
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print(math.bignumber(1.2e+500)); // BigNumber, Infinity WRONG
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print(math.bignumber('1.2e+500')); // BigNumber, 1.2e+500
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console.log();
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// one can work conveniently with BigNumbers using the expression parser.
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// note though that BigNumbers are only supported in arithmetic functions
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console.log('use BigNumbers in the expression parser');
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print(math.eval('0.1 + 0.2')); // BigNumber, 0.3
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print(math.eval('0.3 / 0.2')); // BigNumber, 1.5
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console.log();
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/**
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* Helper function to output a value in the console. Value will be formatted.
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* @param {*} value
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*/
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function print (value) {
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console.log(math.format(value));
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}
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