Exponent

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

Usage

``````var exponentf = require( '@stdlib/number/float32/base/exponent' );
``````

exponentf( x )

Returns an `integer` corresponding to the unbiased exponent of a single-precision floating-point number.

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

var exp = exponentf( toFloat32( 3.14e34 ) ); // => 2^114 ~ 2.08e34
// returns 114

exp = exponentf( toFloat32( 3.14e-34 ) ); //  => 2^-112 ~ 1.93e-34
// returns -112

exp = exponentf( toFloat32( -3.14 ) );
// returns 1

exp = exponentf( 0.0 );
// returns 0

exp = exponentf( NaN );
// returns 128
``````

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 exponentf = require( '@stdlib/number/float32/base/exponent' );

var frac;
var exp;
var x;
var e;
var i;

// Generate random numbers and extract their exponents...
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 );
e = exponentf( x );
console.log( 'x: %d. unbiased exponent: %d.', x, e );
}
``````