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High word mask for the sign bit of a double-precision floating-point number.
import FLOAT64_HIGH_WORD_SIGN_MASK from 'https://cdn.jsdelivr.net/gh/stdlib-js/constants-float64-high-word-sign-mask@esm/index.mjs';High word mask for the sign bit of a double-precision floating-point number.
// 0x80000000 = 2147483648 => 1 00000000000 00000000000000000000
var bool = ( FLOAT64_HIGH_WORD_SIGN_MASK === 0x80000000 );
// returns true- 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.
<!DOCTYPE html>
<html lang="en">
<body>
<script type="module">
import getHighWord from 'https://cdn.jsdelivr.net/gh/stdlib-js/number-float64-base-get-high-word@esm/index.mjs';
import getLowWord from 'https://cdn.jsdelivr.net/gh/stdlib-js/number-float64-base-get-low-word@esm/index.mjs';
import fromWords from 'https://cdn.jsdelivr.net/gh/stdlib-js/number-float64-base-from-words@esm/index.mjs';
import FLOAT64_HIGH_WORD_SIGN_MASK from 'https://cdn.jsdelivr.net/gh/stdlib-js/constants-float64-high-word-sign-mask@esm/index.mjs';
var x = -11.5;
var hi = getHighWord( x ); // 1 10000000010 01110000000000000000
// returns 3223781376
// Mask off all bits except for the sign bit:
var out = (hi & FLOAT64_HIGH_WORD_SIGN_MASK)>>>0; // 1 00000000000 00000000000000000000
// returns 2147483648
// Turn off the sign bit and leave other bits unchanged:
out = hi & (~FLOAT64_HIGH_WORD_SIGN_MASK); // 0 10000000010 01110000000000000000
// returns 1076297728
// Generate a new value:
out = fromWords( out, getLowWord( x ) );
// returns 11.5
</script>
</body>
</html>@stdlib/constants-float64/high-word-exponent-mask: high word mask for the exponent of a double-precision floating-point number.@stdlib/constants-float64/high-word-significand-mask: high word mask for the significand of a double-precision floating-point number.@stdlib/constants-float64/high-word-abs-mask: high word mask for excluding the sign bit of a double-precision floating-point number.
This package is part of stdlib, a standard library 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.
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