Mask for the sign bit of a single-precision floating-point number.
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> Mask for the sign bit of a [single-precision floating-point number][ieee754].
``bash`
npm install @stdlib/constants-float32-sign-mask
`javascript`
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][ieee754].
`javascript`
// 0x80000000 = 2147483648 => 1 00000000 00000000000000000000000
var bool = ( FLOAT32_SIGN_MASK === 0x80000000 );
// returns true
- The higher order word of a [single-precision floating-point number][ieee754] is a 32-bit integer containing the more significant bits which include the exponent and sign.
`javascript
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`
#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][ieee754].
*
- [@stdlib/constants-float32/exponent-mask][@stdlib/constants/float32/exponent-mask]: mask for the exponent of a single-precision floating-point number.
- [@stdlib/constants-float32/significand-mask][@stdlib/constants/float32/significand-mask]: mask for the significand of a single-precision floating-point number.
- [@stdlib/constants-float32/abs-mask][@stdlib/constants/float32/abs-mask]: mask for excluding the sign bit of a single-precision floating-point number.
*
This package is part of [stdlib][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][stdlib], see the main project [repository][stdlib].
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---
See [LICENSE][stdlib-license].
Copyright © 2016-2026. The Stdlib [Authors][stdlib-authors].
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[umd]: https://github.com/umdjs/umd
[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules
[deno-url]: https://github.com/stdlib-js/constants-float32-sign-mask/tree/deno
[deno-readme]: https://github.com/stdlib-js/constants-float32-sign-mask/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/constants-float32-sign-mask/tree/umd
[umd-readme]: https://github.com/stdlib-js/constants-float32-sign-mask/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/constants-float32-sign-mask/tree/esm
[esm-readme]: https://github.com/stdlib-js/constants-float32-sign-mask/blob/esm/README.md
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[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/constants-float32-sign-mask/main/LICENSE
[ieee754]: https://en.wikipedia.org/wiki/IEEE_754-1985
[@stdlib/constants/float32/exponent-mask]: https://www.npmjs.com/package/@stdlib/constants-float32-exponent-mask
[@stdlib/constants/float32/significand-mask]: https://www.npmjs.com/package/@stdlib/constants-float32-significand-mask
[@stdlib/constants/float32/abs-mask]: https://www.npmjs.com/package/@stdlib/constants-float32-abs-mask