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* @license Apache-2.0
*
* Copyright (c) 2024 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var float64ToFloat32 = require( '@stdlib/number/float64/base/to-float32' );
var floorf = require( '@stdlib/math/base/special/floorf' );
var isnanf = require( '@stdlib/math/base/assert/is-nanf' );
var isNegativeZerof = require( '@stdlib/math/base/assert/is-negative-zerof' );
// MAIN //
/**
* Rounds a single-precision floating-point number to the nearest integer.
*
* @param {number} x - input value
* @returns {number} output value
*
* @example
* var v = roundf( -4.2 );
* // returns -4.0
*
* @example
* var v = roundf( -4.5 );
* // returns -4.0
*
* @example
* var v = roundf( -4.6 );
* // returns -5.0
*
* @example
* var v = roundf( 9.99999 );
* // returns 10.0
*
* @example
* var v = roundf( 9.5 );
* // returns 10.0
*
* @example
* var v = roundf( 9.2 );
* // returns 9.0
*
* @example
* var v = roundf( 0.0 );
* // returns 0.0
*
* @example
* var v = roundf( -0.0 );
* // returns -0.0
*
* @example
* var v = roundf( Infinity );
* // returns Infinity
*
* @example
* var v = roundf( -Infinity );
* // returns -Infinity
*
* @example
* var v = roundf( NaN );
* // returns NaN
*/
function roundf( x ) {
if ( isnanf( x ) ) {
return NaN;
}
if ( isNegativeZerof( x ) || ( x >= -0.5 && x < 0.0 ) ) {
return -0.0; // -0
}
if ( x > 0.0 && x < 0.5 ) {
return 0.0; // 0
}
// If the magnitude is big enough, there's no place for the fraction part. If we try to add 0.5 to this number, 1.0 will be added instead...
if ( x >= 8388608.0 || x <= -8388608.0 ) {
return x;
}
return floorf( float64ToFloat32( x + 0.5 ) );
}
// EXPORTS //
module.exports = roundf;
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