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# From Words [![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] > Create a [double-precision floating-point number][ieee754] from a higher order word and a lower order word.
## Installation ```bash npm install @stdlib/number-float64-base-from-words ```
## Usage ```javascript var fromWords = require( '@stdlib/number-float64-base-from-words' ); ``` #### fromWords( high, low ) Creates a [double-precision floating-point number][ieee754] from a higher order word (unsigned 32-bit `integer`) and a lower order word (unsigned 32-bit `integer`). ```javascript var v = fromWords( 1774486211, 2479577218 ); // returns 3.14e201 v = fromWords( 3221823995, 1413754136 ); // returns -3.141592653589793 v = fromWords( 0, 0 ); // returns 0.0 v = fromWords( 2147483648, 0 ); // returns -0.0 v = fromWords( 2146959360, 0 ); // returns NaN v = fromWords( 2146435072, 0 ); // returns Infinity v = fromWords( 4293918720, 0 ); // returns -Infinity ```
## Notes - For more information regarding higher and lower order words, see [to-words][@stdlib/number/float64/base/to-words].
## Examples ```javascript var randu = require( '@stdlib/random-base-randu' ); var round = require( '@stdlib/math-base-special-round' ); var MAX_UINT32 = require( '@stdlib/constants-uint32-max' ); var fromWords = require( '@stdlib/number-float64-base-from-words' ); var high; var low; var x; var i; for ( i = 0; i < 100; i++ ) { high = round( randu()*MAX_UINT32 ); low = round( randu()*MAX_UINT32 ); x = fromWords( high, low ); console.log( 'higher: %d. lower: %d. float: %d.', high, low, x ); } ```
* * *
## C APIs
### Usage ```c #include "stdlib/number/float64/base/from_words.h" ``` #### stdlib_base_float64_from_words( high, low, \*x ) Creates a double-precision floating-point number from a higher order word and a lower order word. ```c #include uint32_t high = 1074339512; uint32_t low = 1374389535; double x; stdlib_base_float64_from_words( high, low, &x ); ``` The function accepts the following arguments: - **high**: `[in] uint32_t` higher order word. - **low**: `[in] uint32_t` lower order word. - **x**: `[out] double*` destination for a double-precision floating-point number. ```c void stdlib_base_float64_from_words( const uint32_t high, const uint32_t low, double *x ); ```
### Examples ```c #include "stdlib/number/float64/base/from_words.h" #include #include int main( void ) { uint32_t high = 1074339512; uint32_t low[] = { 0, 10000, 1000000, 1374389535 }; double x; int i; for ( i = 0; i < 4; i++ ) { stdlib_base_float64_from_words( high, low[ i ], &x ); printf( "high: %u, low: %u => %lf\n", high, low[ i ], x ); } } ```
* * * ## See Also - [`@stdlib/number-float32/base/from-word`][@stdlib/number/float32/base/from-word]: create a single-precision floating-point number from an unsigned integer corresponding to an IEEE 754 binary representation.
* * * ## 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 © 2016-2026. The Stdlib [Authors][stdlib-authors].
[npm-image]: http://img.shields.io/npm/v/@stdlib/number-float64-base-from-words.svg [npm-url]: https://npmjs.org/package/@stdlib/number-float64-base-from-words [test-image]: https://github.com/stdlib-js/number-float64-base-from-words/actions/workflows/test.yml/badge.svg?branch=v0.2.3 [test-url]: https://github.com/stdlib-js/number-float64-base-from-words/actions/workflows/test.yml?query=branch:v0.2.3 [coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/number-float64-base-from-words/main.svg [coverage-url]: https://codecov.io/github/stdlib-js/number-float64-base-from-words?branch=main [chat-image]: https://img.shields.io/badge/zulip-join_chat-brightgreen.svg [chat-url]: https://stdlib.zulipchat.com [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-from-words/tree/deno [deno-readme]: https://github.com/stdlib-js/number-float64-base-from-words/blob/deno/README.md [umd-url]: https://github.com/stdlib-js/number-float64-base-from-words/tree/umd [umd-readme]: https://github.com/stdlib-js/number-float64-base-from-words/blob/umd/README.md [esm-url]: https://github.com/stdlib-js/number-float64-base-from-words/tree/esm [esm-readme]: https://github.com/stdlib-js/number-float64-base-from-words/blob/esm/README.md [branches-url]: https://github.com/stdlib-js/number-float64-base-from-words/blob/main/branches.md [stdlib-license]: https://raw.githubusercontent.com/stdlib-js/number-float64-base-from-words/main/LICENSE [ieee754]: https://en.wikipedia.org/wiki/IEEE_754-1985 [@stdlib/number/float64/base/to-words]: https://www.npmjs.com/package/@stdlib/number-float64-base-to-words [@stdlib/number/float32/base/from-word]: https://www.npmjs.com/package/@stdlib/number-float32-base-from-word