Return an unsigned 32-bit integer corresponding to the less significant 32 bits of a double-precision floating-point number.
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> Return an unsigned 32-bit integer corresponding to the less significant 32 bits of a [double-precision floating-point number][ieee754].
``bash`
npm install @stdlib/number-float64-base-get-low-word
`javascript`
var getLowWord = require( '@stdlib/number-float64-base-get-low-word' );
#### getLowWord( x )
Returns an unsigned 32-bit integer corresponding to the less significant 32 bits of a [double-precision floating-point number][ieee754].
`javascript`
var w = getLowWord( 3.14e201 ); // => 10010011110010110101100010000010
// returns 2479577218
`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 getLowWord = require( '@stdlib/number-float64-base-get-low-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 = getLowWord( x );
console.log( 'x: %d. low word: %d.', x, w );
}
`
*
`c`
#include "stdlib/number/float64/base/get_low_word.h"
#### stdlib_base_float64_get_low_word( x, \*low )
Extracts the unsigned 32-bit integer corresponding to the less significant 32 bits of a double-precision floating-point number.
`c
#include
uint32_t low;
stdlib_base_float64_get_low_word( 3.14, &low );
`
The function accepts the following arguments:
- x: [in] double input value.[out] uint32_t*
- low: destination for lower order word.
`c`
void stdlib_base_float64_get_low_word( const double x, uint32_t *low );
`c
#include "stdlib/number/float64/base/get_low_word.h"
#include
#include
int main( void ) {
double x[] = { 3.14, -3.14, 0.0, 0.0/0.0 };
uint32_t low;
int i;
for ( i = 0; i < 4; i++ ) {
stdlib_base_float64_get_low_word( x[ i ], &low );
printf( "%lf => low: %u\n", x[ i ], low );
}
}
`
*
- [@stdlib/number-float64/base/get-high-word][@stdlib/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.
- [@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.
*
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
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---
See [LICENSE][stdlib-license].
Copyright © 2016-2026. The Stdlib [Authors][stdlib-authors].
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[umd]: https://github.com/umdjs/umd
[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules
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[deno-readme]: https://github.com/stdlib-js/number-float64-base-get-low-word/blob/deno/README.md
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[esm-url]: https://github.com/stdlib-js/number-float64-base-get-low-word/tree/esm
[esm-readme]: https://github.com/stdlib-js/number-float64-base-get-low-word/blob/esm/README.md
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[ieee754]: https://en.wikipedia.org/wiki/IEEE_754-1985
[@stdlib/number/float64/base/get-high-word]: https://www.npmjs.com/package/@stdlib/number-float64-base-get-high-word
[@stdlib/number/float64/base/set-high-word]: https://www.npmjs.com/package/@stdlib/number-float64-base-set-high-word