@stdlib/number-float64-base-from-words
Advanced tools
Create a double-precision floating-point number from a higher order word and a lower order word.
@stdlib/number-float64-base-from-words is a utility package that allows you to create a double-precision floating-point number from higher and lower order words (32-bit integers). This can be useful in low-level programming tasks, such as manipulating the binary representation of floating-point numbers.
Create a double-precision floating-point number from words
This feature allows you to create a double-precision floating-point number by specifying the higher and lower order words. In this example, the high word is 1074266112 and the low word is 0, which combine to form the number 3.14.
const fromWords = require('@stdlib/number-float64-base-from-words');
const high = 1074266112;
const low = 0;
const num = fromWords(high, low);
console.log(num); // 3.14The 'ieee754' package provides functions for encoding and decoding IEEE 754 floating-point numbers. It allows you to convert between binary representations and JavaScript numbers, similar to @stdlib/number-float64-base-from-words, but with a broader focus on IEEE 754 standards.
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Create a double-precision floating-point number from a higher order word and a lower order word.
npm install @stdlib/number-float64-base-from-words
var fromWords = require( '@stdlib/number-float64-base-from-words' );
Creates a double-precision floating-point number from a higher order word (unsigned 32-bit integer) and a lower order word (unsigned 32-bit integer).
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
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 );
}
#include "stdlib/number/float64/base/from_words.h"
Creates a double-precision floating-point number from a higher order word and a lower order word.
#include <stdint.h>
uint32_t high = 1074339512;
uint32_t low = 1374389535;
double x;
stdlib_base_float64_from_words( high, low, &x );
The function accepts the following arguments:
[in] uint32_t higher order word.[in] uint32_t lower order word.[out] double* destination for a double-precision floating-point number.void stdlib_base_float64_from_words( const uint32_t high, const uint32_t low, double *x );
#include "stdlib/number/float64/base/from_words.h"
#include <stdint.h>
#include <stdio.h>
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 );
}
}
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.
See LICENSE.
Copyright © 2016-2023. The Stdlib Authors.
0.1.0 (2023-09-23)
<section class="features">898e8e4 - update minimum TypeScript version898e8e4: update minimum TypeScript version to 4.1
898e8e4 - feat: update minimum TypeScript version (by Philipp Burckhardt)0e39133 - chore: use strictEqual checks and resolve lint errors (by Philipp Burckhardt)28e1c84 - docs: resolve C lint errors (by Athan Reines)A total of 2 people contributed to this release. Thank you to the following contributors:
FAQs
Create a double-precision floating-point number from a higher order word and a lower order word.
The npm package @stdlib/number-float64-base-from-words receives a total of 363,229 weekly downloads. As such, @stdlib/number-float64-base-from-words popularity was classified as popular.
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