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42 lines
1.4 KiB
JavaScript
42 lines
1.4 KiB
JavaScript
// big numbers
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// load math.js and create an instance
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// the default type of numbers is configured as big numbers
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var mathjs = require('../index'),
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math = mathjs({
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number: {
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defaultType: 'number', // Choose from: 'number' (default), 'bignumber'
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precision: 20 // number of digits for big numbers
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}
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});
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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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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 big numbers');
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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 big numbers 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 big numbers using the expression parser.
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// note though that big numbers are only supported in arithmetic functions
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console.log('use big numbers 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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