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    @stdlib/number-float64-base-get-low-word
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    0.0.6 • Public • Published

    Low Word

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

    Installation

    npm install @stdlib/number-float64-base-get-low-word

    Usage

    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.

    var w = getLowWord( 3.14e201 ); // => 10010011110010110101100010000010
    // returns 2479577218

    Examples

    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 APIs

    Usage

    #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.

    #include <stdint.h>
    
    uint32_t low;
    stdlib_base_float64_get_low_word( 3.14, &low );

    The function accepts the following arguments:

    • x: [in] double input value.
    • low: [out] uint32_t* destination for lower order word.
    void stdlib_base_float64_get_low_word( const double x, uint32_t *low );

    Examples

    #include "stdlib/number/float64/base/get_low_word.h"
    #include <stdint.h>
    #include <stdio.h>
    
    int main() {
        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 );
        }
    }

    Notice

    This package is part of 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, see the main project repository.

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    License

    See LICENSE.

    Copyright

    Copyright © 2016-2022. The Stdlib Authors.

    Install

    npm i @stdlib/number-float64-base-get-low-word

    Homepage

    stdlib.io

    DownloadsWeekly Downloads

    43,374

    Version

    0.0.6

    License

    Apache-2.0

    Unpacked Size

    49.2 kB

    Total Files

    16

    Last publish

    Collaborators

    • stdlib-bot
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    • planeshifter
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