@stdlib/constants-float32-sign-mask v0.2.1

FLOAT32_SIGN_MASK

Mask for the sign bit of a single-precision floating-point number.

Installation

npm install @stdlib/constants-float32-sign-mask

Usage

var FLOAT32_SIGN_MASK = require( '@stdlib/constants-float32-sign-mask' );

FLOAT32_SIGN_MASK

Mask for the sign bit of a single-precision floating-point number.

// 0x80000000 = 2147483648 => 1 00000000 00000000000000000000000
var bool = ( FLOAT32_SIGN_MASK === 0x80000000 );
// returns true

Notes

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

Examples

var toWord = require( '@stdlib/number-float32-base-to-word' );
var fromWord = require( '@stdlib/number-float32-base-from-word' );
var FLOAT32_SIGN_MASK = require( '@stdlib/constants-float32-sign-mask' );

var x = -11.5;
var w = toWord( x ); // 1 10000010 01110000000000000000000
// returns 3223781376

// Mask off all bits except for the sign bit:
var out = (w & FLOAT32_SIGN_MASK)>>>0; // 1 00000000 00000000000000000000000
// returns 2147483648

// Turn off the sign bit and leave other bits unchanged:
out = w & (~FLOAT32_SIGN_MASK); // 0 10000010 01110000000000000000000
// returns 1076297728

// Generate a new value:
out = fromWord( out );
// returns 11.5

C APIs

Usage

#include "stdlib/constants/float32/sign_mask.h"

STDLIB_CONSTANT_FLOAT32_SIGN_MASK

Macro for the mask for the sign bit of a single-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.