# @stdlib/math-base-special-trunc

0.2.2 • Public • Published

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# Truncate

Round a double-precision floating-point number toward zero.

## Installation

`npm install @stdlib/math-base-special-trunc`

## Usage

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

#### trunc( x )

Rounds a double-precision floating-point number toward zero.

```var v = trunc( -4.2 );
// returns -4.0

v = trunc( 9.99999 );
// returns 9.0

v = trunc( 0.0 );
// returns 0.0

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

v = trunc( NaN );
// returns NaN

v = trunc( Infinity );
// returns Infinity

v = trunc( -Infinity );
// returns -Infinity```

## Examples

```var randu = require( '@stdlib/random-base-randu' );
var trunc = require( '@stdlib/math-base-special-trunc' );

var x;
var i;

for ( i = 0; i < 100; i++ ) {
x = (randu()*100.0) - 50.0;
console.log( 'trunc(%d) = %d', x, trunc( x ) );
}```

## C APIs

### Usage

`#include "stdlib/math/base/special/trunc.h"`

#### stdlib_base_trunc( x )

Rounds a double-precision floating-point number toward zero.

```double y = stdlib_base_trunc( 3.14 );
// returns 3.0```

The function accepts the following arguments:

• x: `[in] double` input value.
`double stdlib_base_trunc( const double x );`

### Examples

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

int main( void ) {
const double x[] = { 3.14, -3.14, 0.0, 0.0/0.0 };

double y;
int i;
for ( i = 0; i < 4; i++ ) {
y = stdlib_base_trunc( x[ i ] );
printf( "trunc(%lf) = %lf\n", x[ i ], y );
}
}```

## 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.

## Package Sidebar

### Install

`npm i @stdlib/math-base-special-trunc`

### Repository

github.com/stdlib-js/math-base-special-trunc

stdlib.io

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