@stdlib/constants-float64-high-word-exponent-mask

FLOAT64_HIGH_WORD_EXPONENT_MASK

High word mask for the exponent of a double-precision floating-point number.

Installation

npm install @stdlib/constants-float64-high-word-exponent-mask

Usage

var FLOAT64_HIGH_WORD_EXPONENT_MASK = require( '@stdlib/constants-float64-high-word-exponent-mask' );

FLOAT64_HIGH_WORD_EXPONENT_MASK

High word mask for the exponent of a double-precision floating-point number.

// 0x7ff00000 = 2146435072 => 0 11111111111 00000000000000000000
var bool = ( FLOAT64_HIGH_WORD_EXPONENT_MASK === 0x7ff00000 );
// returns true

Notes

The higher order word of a double-precision floating-point number is a 32-bit integer containing the more significant bits which include the exponent and sign.

Examples

var getHighWord = require( '@stdlib/number-float64-base-get-high-word' );
var FLOAT64_HIGH_WORD_EXPONENT_MASK = require( '@stdlib/constants-float64-high-word-exponent-mask' );

var x = 11.5;
var hi = getHighWord( x ); // 0 10000000010 01110000000000000000
// returns 1076297728

// Mask off all bits except for the exponent bits:
var out = hi & FLOAT64_HIGH_WORD_EXPONENT_MASK; // 0 10000000010 00000000000000000000
// returns 1075838976

// Mask on the exponent bits and leave other bits unchanged:
out = hi | FLOAT64_HIGH_WORD_EXPONENT_MASK; // 0 11111111111 01110000000000000000
// returns 2146893824

C APIs

Usage

#include "stdlib/constants/float64/high_word_exponent_mask.h"

STDLIB_CONSTANT_FLOAT64_HIGH_WORD_EXPONENT_MASK

Macro for the high word mask for the exponent 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.