@stdlib/number-float64-base-get-high-word
v0.2.2
Published
Return an unsigned 32-bit integer corresponding to the more significant 32 bits of a double-precision floating-point number.
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High Word
Return an unsigned 32-bit integer corresponding to the more significant 32 bits of a double-precision floating-point number.
Installation
npm install @stdlib/number-float64-base-get-high-word
Usage
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.
var w = getHighWord( 3.14e201 ); // => 01101001110001001000001011000011
// returns 1774486211
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 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
#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.
#include <stdint.h>
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.
void stdlib_base_float64_get_high_word( const double x, uint32_t *high );
Examples
#include "stdlib/number/float64/base/get_high_word.h"
#include <stdint.h>
#include <stdio.h>
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
: 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
: set the more significant 32 bits of a double-precision floating-point number.
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.
Community
License
See LICENSE.
Copyright
Copyright © 2016-2024. The Stdlib Authors.