significandf

Return an integer corresponding to the significand of a single-precision floating-point number.

Installation

npm install @stdlib/number-float32-base-significand

Usage

var significandf = require( '@stdlib/number-float32-base-significand' );

significandf( x )

Returns an integer corresponding to the significand of a single-precision floating-point number.

var toFloat32 = require( '@stdlib/number-float64-base-to-float32' );

var s = significandf( toFloat32( 3.14e34 ) ); // => 10000011000010001110111
// returns 4293751

s = significandf( toFloat32( 3.14e-34 ) ); // => 10100001011000001010101
// returns 5288021

s = significandf( toFloat32( -3.14 ) ); // => 10010001111010111000011
// returns 4781507

s = significandf( 0.0 ); // => 00000000000000000000000
// returns 0

s = significandf( NaN ); // => 10000000000000000000000
// returns 4194304

Examples

var randu = require( '@stdlib/random-base-randu' );
var round = require( '@stdlib/math-base-special-round' );
var pow = require( '@stdlib/math-base-special-pow' );
var toFloat32 = require( '@stdlib/number-float64-base-to-float32' );
var significandf = require( '@stdlib/number-float32-base-significand' );

var frac;
var exp;
var x;
var s;
var i;

// Generate random numbers and extract their significands...
for ( i = 0; i < 100; i++ ) {
    frac = randu() * 10.0;
    exp = round( randu()*44.0 ) - 22;
    x = frac * pow( 10.0, exp );
    x = toFloat32( x );
    s = significandf( x );
    console.log( 'x: %d. significand: %d.', x, s );
}

C APIs

Usage

#include "stdlib/number/float32/base/significand.h"

stdlib_base_float32_significand( x )

Returns an integer y corresponding to the significand of a single-precision floating-point number x.

#include <stdint.h>

int32_t y;
stdlib_base_float32_significand( 3.14f );

The function accepts the following arguments:

• x: [in] float input value.

int32_t stdlib_base_float32_significand( const float x );

Examples

#include "stdlib/number/float32/base/significand.h"
#include <stdint.h>
#include <stdio.h>
#include <inttypes.h>

int main( void ) {
    float x[] = { 4.0f, 0.0f, -0.0f, 1.0f, -1.0f, 3.14f, -3.14f, 1.0e38f, -1.0e38f, 1.0f/0.0f, -1.0f/0.0f, 0.0f/0.0f };

    int32_t out;
    int i;
    for ( i = 0; i < 12; i++ ) {
        out = stdlib_base_float32_significand( x[ i ] );
        printf( "%f => %" PRId32 "\n", x[ i ], out );
    }
}

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.