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https://github.com/stdlib-js/number-float64-base-get-high-word
Return an unsigned 32-bit integer corresponding to the more significant 32 bits of a double-precision floating-point number.
https://github.com/stdlib-js/number-float64-base-get-high-word
base dbl double float float64 floating-point high javascript node node-js nodejs stdlib type types util utilities utility utils word words
Last synced: 6 days ago
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Return an unsigned 32-bit integer corresponding to the more significant 32 bits of a double-precision floating-point number.
- Host: GitHub
- URL: https://github.com/stdlib-js/number-float64-base-get-high-word
- Owner: stdlib-js
- License: apache-2.0
- Created: 2021-06-15T16:54:27.000Z (over 3 years ago)
- Default Branch: main
- Last Pushed: 2024-10-01T06:08:23.000Z (about 1 month ago)
- Last Synced: 2024-10-13T00:33:26.557Z (25 days ago)
- Topics: base, dbl, double, float, float64, floating-point, high, javascript, node, node-js, nodejs, stdlib, type, types, util, utilities, utility, utils, word, words
- Language: Python
- Homepage: https://github.com/stdlib-js/stdlib
- Size: 609 KB
- Stars: 1
- Watchers: 3
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- Contributing: CONTRIBUTING.md
- License: LICENSE
- Code of conduct: CODE_OF_CONDUCT.md
- Citation: CITATION.cff
- Security: SECURITY.md
Awesome Lists containing this project
README
About stdlib...
We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.
The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.
When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.
To join us in bringing numerical computing to the web, get started by checking us out on GitHub, and please consider financially supporting stdlib. We greatly appreciate your continued support!
# High Word
[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url]
> Return an unsigned 32-bit integer corresponding to the more significant 32 bits of a [double-precision floating-point number][ieee754].
## Installation
```bash
npm install @stdlib/number-float64-base-get-high-word
```
Alternatively,
- To load the package in a website via a `script` tag without installation and bundlers, use the [ES Module][es-module] available on the [`esm`][esm-url] branch (see [README][esm-readme]).
- If you are using Deno, visit the [`deno`][deno-url] branch (see [README][deno-readme] for usage intructions).
- For use in Observable, or in browser/node environments, use the [Universal Module Definition (UMD)][umd] build available on the [`umd`][umd-url] branch (see [README][umd-readme]).
The [branches.md][branches-url] file summarizes the available branches and displays a diagram illustrating their relationships.
To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.
## Usage
```javascript
var getHighWord = require( '@stdlib/number-float64-base-get-high-word' );
```
#### getHighWord( x )
Returns an unsigned 32-bit `integer` corresponding to the more significant 32 bits of a [double-precision floating-point number][ieee754].
```javascript
var w = getHighWord( 3.14e201 ); // => 01101001110001001000001011000011
// returns 1774486211
```
## Examples
```javascript
var floor = require( '@stdlib/math-base-special-floor' );
var randu = require( '@stdlib/random-base-randu' );
var pow = require( '@stdlib/math-base-special-pow' );
var getHighWord = require( '@stdlib/number-float64-base-get-high-word' );
var frac;
var exp;
var w;
var x;
var i;
for ( i = 0; i < 100; i++ ) {
frac = randu() * 10.0;
exp = -floor( randu()*324.0 );
x = frac * pow( 10.0, exp );
w = getHighWord( x );
console.log( 'x: %d. high word: %d.', x, w );
}
```
* * *
## C APIs
### Usage
```c
#include "stdlib/number/float64/base/get_high_word.h"
```
#### stdlib_base_float64_get_high_word( x, \*high )
Extracts the unsigned 32-bit integer corresponding to the more significant 32 bits of a double-precision floating-point number.
```c
#include
uint32_t high;
stdlib_base_float64_get_high_word( 3.14, &high );
```
The function accepts the following arguments:
- **x**: `[in] double` input value.
- **high**: `[out] uint32_t*` destination for higher order word.
```c
void stdlib_base_float64_get_high_word( const double x, uint32_t *high );
```
### Examples
```c
#include "stdlib/number/float64/base/get_high_word.h"
#include
#include
int main( void ) {
double x[] = { 3.14, -3.14, 0.0, 0.0/0.0 };
uint32_t high;
int i;
for ( i = 0; i < 4; i++ ) {
stdlib_base_float64_get_high_word( x[ i ], &high );
printf( "%lf => high: %u\n", x[ i ], high );
}
}
```
* * *
## See Also
- [`@stdlib/number-float64/base/get-low-word`][@stdlib/number/float64/base/get-low-word]: return an unsigned 32-bit integer corresponding to the less significant 32 bits of a double-precision floating-point number.
- [`@stdlib/number-float64/base/set-high-word`][@stdlib/number/float64/base/set-high-word]: set the more significant 32 bits of a double-precision floating-point number.
* * *
## Notice
This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].
#### Community
[![Chat][chat-image]][chat-url]
---
## License
See [LICENSE][stdlib-license].
## Copyright
Copyright © 2016-2024. The Stdlib [Authors][stdlib-authors].
[npm-image]: http://img.shields.io/npm/v/@stdlib/number-float64-base-get-high-word.svg
[npm-url]: https://npmjs.org/package/@stdlib/number-float64-base-get-high-word
[test-image]: https://github.com/stdlib-js/number-float64-base-get-high-word/actions/workflows/test.yml/badge.svg?branch=main
[test-url]: https://github.com/stdlib-js/number-float64-base-get-high-word/actions/workflows/test.yml?query=branch:main
[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/number-float64-base-get-high-word/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/number-float64-base-get-high-word?branch=main
[chat-image]: https://img.shields.io/gitter/room/stdlib-js/stdlib.svg
[chat-url]: https://app.gitter.im/#/room/#stdlib-js_stdlib:gitter.im
[stdlib]: https://github.com/stdlib-js/stdlib
[stdlib-authors]: https://github.com/stdlib-js/stdlib/graphs/contributors
[umd]: https://github.com/umdjs/umd
[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules
[deno-url]: https://github.com/stdlib-js/number-float64-base-get-high-word/tree/deno
[deno-readme]: https://github.com/stdlib-js/number-float64-base-get-high-word/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/number-float64-base-get-high-word/tree/umd
[umd-readme]: https://github.com/stdlib-js/number-float64-base-get-high-word/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/number-float64-base-get-high-word/tree/esm
[esm-readme]: https://github.com/stdlib-js/number-float64-base-get-high-word/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/number-float64-base-get-high-word/blob/main/branches.md
[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/number-float64-base-get-high-word/main/LICENSE
[ieee754]: https://en.wikipedia.org/wiki/IEEE_754-1985
[@stdlib/number/float64/base/get-low-word]: https://github.com/stdlib-js/number-float64-base-get-low-word
[@stdlib/number/float64/base/set-high-word]: https://github.com/stdlib-js/number-float64-base-set-high-word