npm package: @stdlib/number-float64-base-sub
Description: Subtract two double-precision floating-point numbers.
Author: The Stdlib Authors
Latest version: 0.1.1

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<details>
  <summary>
    About stdlib...
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  <p>We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.</p>
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# sub

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> Subtract two double-precision floating-point numbers.

<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->

<section class="intro">

</section>

<!-- /.intro -->

<!-- Package usage documentation. -->

<section class="installation">

## Installation

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

</section>

<section class="usage">

## Usage

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

#### sub( x, y )

Subtracts two double-precision floating-point numbers.

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

v = sub( 2.0, 5.0 );
// returns -3.0

v = sub( 0.0, 5.0 );
// returns -5.0

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

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

</section>

<!-- /.usage -->

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<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' );
var sub = require( '@stdlib/number-float64-base-sub' );

var x;
var y;
var i;

for ( i = 0; i < 100; i++ ) {
    x = rand( -50, 50 );
    y = rand( -50, 50 );
    console.log( '%d - %d = %d', x, y, sub( x, y ) );
}
```

</section>

<!-- /.examples -->

<!-- C interface documentation. -->

* * *

<section class="c">

## C APIs

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<section class="intro">

</section>

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<section class="usage">

### Usage

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

#### stdlib_base_float64_sub( x, y )

Subtracts two double-precision floating-point numbers.

```c
double v = stdlib_base_float64_sub( -5.0, 2.0 );
// returns -7.0
```

The function accepts the following arguments:

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

```c
double stdlib_base_float64_sub( const double x, const double y );
```

</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/sub.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 };

    double z;
    int i;
    for ( i = 0; i < 4; i++ ) {
        z = stdlib_base_float64_sub( x[ i ], y[ i ] );
        printf( "%lf - %lf = %lf\n", x[ i ], y[ i ], z );
    }
}
```

</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>
-   <span class="package-name">[`@stdlib/number-float64/base/div`][@stdlib/number/float64/base/div]</span><span class="delimiter">: </span><span class="description">divide two double-precision floating-point numbers.</span>
-   <span class="package-name">[`@stdlib/number-float64/base/mul`][@stdlib/number/float64/base/mul]</span><span class="delimiter">: </span><span class="description">multiply two double-precision floating-point numbers.</span>

</section>

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* * *

## 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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