FLOAT32_SIGN_MASK

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

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.