math-float64-get-high-word

High Word

Returns an unsigned 32-bit integer corresponding to the more significant 32 bits of a double-precision floating-point number.

Installation

$ npm install math-float64-get-high-word

Usage

var highWord = require( 'math-float64-get-high-word' );

highWord( x )

Returns an unsigned 32-bit integer corresponding to the more significant 32 bits of a double-precision floating-point number.

var w = highWord( 3.14e201 );
// returns 1774486211 => 01101001110001001000001011000011

Examples

var floor = require( 'math-floor' );
var pow = require( 'math-power' );
var highWord = require( 'math-float64-get-high-word' );
 
var frac;
var exp;
var w;
var x;
var i;
 
for ( i = 0; i < 100; i++ ) {
    frac = Math.random() * 10;
    exp = -floor( Math.random()*324 );
    x = frac * pow( 10, exp );
    w = highWord( x );
    console.log( 'x: %d. high word: %d.', x, w );
}

To run the example code from the top-level application directory,

$ node ./examples/index.js

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Tests

Unit

This repository uses tape for unit tests. To run the tests, execute the following command in the top-level application directory:

$ make test

All new feature development should have corresponding unit tests to validate correct functionality.

Test Coverage

This repository uses Istanbul as its code coverage tool. To generate a test coverage report, execute the following command in the top-level application directory:

$ make test-cov

Istanbul creates a ./reports/coverage directory. To access an HTML version of the report,

$ make view-cov

Browser Support

This repository uses Testling for browser testing. To run the tests in a (headless) local web browser, execute the following command in the top-level application directory:

$ make test-browsers

To view the tests in a local web browser,

$ make view-browser-tests

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License

MIT license.

Copyright

Copyright © 2016. The Compute.io Authors.