Round

Round a single-precision floating-point number to the nearest integer.

Installation

npm install @stdlib/math-base-special-roundf

Usage

var roundf = require( '@stdlib/math-base-special-roundf' );

roundf( x )

Rounds a single-precision floating-point number to the nearest integer.

var v = roundf( -4.2 );
// returns -4.0

v = roundf( -4.5 );
// returns -4.0

v = roundf( -4.6 );
// returns -5.0

v = roundf( 9.99999 );
// returns 10.0

v = roundf( 9.5 );
// returns 10.0

v = roundf( 9.2 );
// returns 9.0

v = roundf( 0.0 );
// returns 0.0

v = roundf( -0.0 );
// returns -0.0

v = roundf( Infinity );
// returns Infinity

v = roundf( -Infinity );
// returns -Infinity

v = roundf( NaN );
// returns NaN

Notes

• Ties are rounded toward positive infinity.

Examples

var uniform = require( '@stdlib/random-array-uniform' );
var logEachMap = require( '@stdlib/console-log-each-map' );
var roundf = require( '@stdlib/math-base-special-roundf' );

var opts = {
    'dtype': 'float32'
};
var x = uniform( 100, -50.0, 50.0, opts );

logEachMap( 'Value: %0.4f. Rounded: %0.4f.', x, roundf );

C APIs

Usage

#include "stdlib/math/base/special/roundf.h"

stdlib_base_roundf( x )

Rounds a single-precision floating-point number to the nearest integer.

float out = stdlib_base_roundf( -4.2f );
// returns -4.0f

The function accepts the following arguments:

• x: [in] float input value.

float stdlib_base_roundf( const float x );

Examples

#include "stdlib/math/base/special/roundf.h"
#include <stdio.h>

int main( void ) {
    const float x[] = { -5.0f, -3.89f, -2.78f, -1.67f, -0.56f, 0.56f, 1.67f, 2.78f, 3.89f, 5.0f };

    float v;
    int i;
    for ( i = 0; i < 10; i++ ) {
        v = stdlib_base_roundf( x[ i ] );
        printf( "roundf(%f) = %f\n", x[ i ], v );
    }
}

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 © 2016-2026. The Stdlib Authors.