npm package: @stdlib/number-float64-base-add3
Description: Compute the sum of three double-precision floating-point numbers.
Author: The Stdlib Authors
Latest version: 0.1.1

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# add3

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> Compute the sum of three double-precision floating-point numbers.

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<section class="intro">

</section>

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<!-- Package usage documentation. -->

<section class="installation">

## Installation

```bash
npm install @stdlib/number-float64-base-add3
```

</section>

<section class="usage">

## Usage

```javascript
var add3 = require( '@stdlib/number-float64-base-add3' );
```

#### add3( x, y, z )

Computes the sum of three double-precision floating-point numbers.

```javascript
var v = add3( -1.0, 5.0, 2.0 );
// returns 6.0

v = add3( 2.0, 5.0, 2.0 );
// returns 9.0

v = add3( 0.0, 5.0, 2.0 );
// returns 7.0

v = add3( -0.0, 0.0, 0.0 );
// returns 0.0

v = add3( NaN, NaN, NaN );
// returns NaN
```

</section>

<!-- /.usage -->

<!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->

<section class="notes">

</section>

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<!-- Package usage examples. -->

<section class="examples">

## Examples

<!-- eslint no-undef: "error" -->

```javascript
var rand = require( '@stdlib/random-base-discrete-uniform' ).factory;
var filledBy = require( '@stdlib/array-base-filled-by' );
var add3 = require( '@stdlib/number-float64-base-add3' );

var x = filledBy( 100, rand( -50, 50 ) );
var y = filledBy( x.length, rand( -50, 50 ) );
var z = filledBy( x.length, rand( -50, 50 ) );

var i;
for ( i = 0; i < x.length; i++ ) {
    console.log( '%d + %d + %d = %d', x[i], y[i], z[i], add3( x[i], y[i], z[i] ) );
}
```

</section>

<!-- /.examples -->

<!-- C interface documentation. -->

* * *

<section class="c">

## C APIs

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<section class="intro">

</section>

<!-- /.intro -->

<!-- C usage documentation. -->

<section class="usage">

### Usage

```c
#include "stdlib/number/float64/base/add3.h"
```

#### stdlib_base_float64_add3( x, y, z )

Computes the sum of three double-precision floating-point numbers.

```c
double out = stdlib_base_float64_add3( -5.0, 2.0, 4.0 );
// returns 1.0
```

The function accepts the following arguments:

-   **x**: `[in] double` first input value.
-   **y**: `[in] double` second input value.
-   **z**: `[in] double` third input value.

```c
double stdlib_base_float64_add3( const double x, const double y, const double z );
```

</section>

<!-- /.usage -->

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<section class="notes">

</section>

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<!-- C API usage examples. -->

<section class="examples">

### Examples

```c
#include "stdlib/number/float64/base/add3.h"
#include <stdio.h>

int main( void ) {
    const double x[] = { 3.14, -3.14, 0.0, 0.0/0.0 };
    const double y[] = { 3.14, -3.14, -0.0, 0.0/0.0 };
    const double z[] = { 2.0, -3.0, -0.0, 0.0/0.0 };

    double out;
    int i;
    for ( i = 0; i < 4; i++ ) {
        out = stdlib_base_float64_add3( x[ i ], y[ i ], z[ i ] );
        printf( "%lf + %lf + %lf = %lf\n", x[ i ], y[ i ], z[ i ], out );
    }
}
```

</section>

<!-- /.examples -->

</section>

<!-- /.c -->

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<section class="related">

* * *

## See Also

-   <span class="package-name">[`@stdlib/number-float64/base/add`][@stdlib/number/float64/base/add]</span><span class="delimiter">: </span><span class="description">compute the sum of two double-precision floating-point numbers.</span>

</section>

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<section class="main-repo" >

* * *

## Notice

This package is part of [stdlib][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][stdlib], see the main project [repository][stdlib].

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---

## License

See [LICENSE][stdlib-license].


## Copyright

Copyright &copy; 2016-2026. The Stdlib [Authors][stdlib-authors].

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