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Original file line number Diff line number Diff line change
@@ -0,0 +1,182 @@
<!--

@license Apache-2.0

Copyright (c) 2025 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.

-->

# FLOAT16_MAX_SAFE_NTH_LUCAS

> Maximum safe nth [Lucas number][lucas-number] when stored in [half-precision floating-point][half-precision-floating-point-format] format.

<section class="usage">

## Usage

<!-- eslint-disable id-length -->

```javascript
var FLOAT16_MAX_SAFE_NTH_LUCAS = require( '@stdlib/constants/float16/max-safe-nth-lucas' );
```

#### FLOAT16_MAX_SAFE_NTH_LUCAS

The maximum [safe][safe-integers] nth [Lucas number][lucas-number] when stored in [half-precision floating-point][half-precision-floating-point-format] format.

<!-- eslint-disable id-length -->

```javascript
var bool = ( FLOAT16_MAX_SAFE_NTH_LUCAS === 16 );
// returns true
```

</section>

<!-- /.usage -->

<section class="examples">

## Examples

<!-- eslint-disable id-length -->

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

```javascript
var FLOAT16_MAX_SAFE_NTH_LUCAS = require( '@stdlib/constants/float16/max-safe-nth-lucas' );

function lucas( n ) {
var a;
var b;
var c;
var i;

a = 2;
if ( n === 0 ) {
return a;
}
b = 1;
for ( i = 2; i <= n; i++ ) {
c = a + b;
a = b;
b = c;
}
return b;
}

var v;
var i;
for ( i = 0; i < 100; i++ ) {
v = lucas( i );
if ( i > FLOAT16_MAX_SAFE_NTH_LUCAS ) {
console.log( 'Unsafe: %d', v );
} else {
console.log( 'Safe: %d', v );
}
}
```

</section>

<!-- /.examples -->

<!-- C interface documentation. -->

* * *

<section class="c">

## C APIs

<!-- 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 -->

<!-- C usage documentation. -->

<section class="usage">

### Usage

```c
#include "stdlib/constants/float16/max_safe_nth_lucas.h"
```

#### STDLIB_CONSTANT_FLOAT16_MAX_SAFE_NTH_LUCAS

Macro for the maximum [safe][safe-integers] nth [Lucas number][lucas-number] when stored in [half-precision floating-point][half-precision-floating-point-format] format.

</section>

<!-- /.usage -->

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

<section class="notes">

</section>

<!-- /.notes -->

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

<section class="examples">

</section>

<!-- /.examples -->

</section>

<!-- /.c -->

<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->

<section class="related">

* * *

## See Also

- <span class="package-name">[`@stdlib/constants/float32/max-safe-nth-lucas`][@stdlib/constants/float32/max-safe-nth-lucas]</span><span class="delimiter">: </span><span class="description">maximum safe nth Lucas number when stored in single-precision floating-point format.</span>

</section>

<!-- /.related -->

<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->

<section class="links">

[safe-integers]: http://www.2ality.com/2013/10/safe-integers.html

[lucas-number]: https://en.wikipedia.org/wiki/Lucas_number

[half-precision-floating-point-format]: https://en.wikipedia.org/wiki/Half-precision_floating-point_format

<!-- <related-links> -->

[@stdlib/constants/float32/max-safe-nth-lucas]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/constants/float32/max-safe-nth-lucas

<!-- </related-links> -->

</section>

<!-- /.links -->
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{{alias}}
Maximum safe nth Lucas number when stored in half-precision floating-point
format.

Examples
--------
> {{alias}}
16

See Also
--------

Original file line number Diff line number Diff line change
@@ -0,0 +1,33 @@
/*
* @license Apache-2.0
*
* Copyright (c) 2025 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.
*/

// TypeScript Version: 4.1

/**
* Maximum safe nth Lucas number when stored in half-precision floating-point format.
*
* @example
* var max = FLOAT16_MAX_SAFE_NTH_LUCAS;
* // returns 16
*/
declare const FLOAT16_MAX_SAFE_NTH_LUCAS: number;


// EXPORTS //

export = FLOAT16_MAX_SAFE_NTH_LUCAS;
Original file line number Diff line number Diff line change
@@ -0,0 +1,28 @@
/*
* @license Apache-2.0
*
* Copyright (c) 2025 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.
*/

import FLOAT16_MAX_SAFE_NTH_LUCAS = require( './index' );


// TESTS //

// The export is a number...
{
// eslint-disable-next-line @typescript-eslint/no-unused-expressions
FLOAT16_MAX_SAFE_NTH_LUCAS; // $ExpectType number
}
Original file line number Diff line number Diff line change
@@ -0,0 +1,51 @@
/**
* @license Apache-2.0
*
* Copyright (c) 2025 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';

var FLOAT16_MAX_SAFE_NTH_LUCAS = require( './../lib' ); // eslint-disable-line id-length

function lucas( n ) {
var a;
var b;
var c;
var i;

a = 2;
if ( n === 0 ) {
return a;
}
b = 1;
for ( i = 2; i <= n; i++ ) {
c = a + b;
a = b;
b = c;
}
return b;
}

var v;
var i;
for ( i = 0; i < 100; i++ ) {
v = lucas( i );
if ( i > FLOAT16_MAX_SAFE_NTH_LUCAS ) {
console.log( 'Unsafe: %d', v );
} else {
console.log( 'Safe: %d', v );
}
}
Original file line number Diff line number Diff line change
@@ -0,0 +1,27 @@
/**
* @license Apache-2.0
*
* Copyright (c) 2025 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.
*/

#ifndef STDLIB_CONSTANTS_FLOAT16_MAX_SAFE_NTH_LUCAS_H
#define STDLIB_CONSTANTS_FLOAT16_MAX_SAFE_NTH_LUCAS_H

/**
* Macro for the maximum safe nth Lucas number when stored in half-precision floating-point format.
*/
#define STDLIB_CONSTANT_FLOAT16_MAX_SAFE_NTH_LUCAS 16

#endif // !STDLIB_CONSTANTS_FLOAT16_MAX_SAFE_NTH_LUCAS_H
Original file line number Diff line number Diff line change
@@ -0,0 +1,51 @@
/**
* @license Apache-2.0
*
* Copyright (c) 2025 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.
*/

/* eslint-disable id-length */

'use strict';

/**
* Maximum safe nth Lucas number when stored in half-precision floating-point format.
*
* @module @stdlib/constants/float16/max-safe-nth-lucas
* @type {integer}
*
* @example
* var FLOAT16_MAX_SAFE_NTH_LUCAS = require( '@stdlib/constants/float16/max-safe-nth-lucas' );
* // returns 16
*/


// MAIN //

/**
* The maximum safe nth Lucas number when stored in half-precision floating-point format.
*
* @constant
* @type {integer}
* @default 16
* @see [Lucas number]{@link https://en.wikipedia.org/wiki/Lucas_number}
* @see [Half-precision floating-point format]{@link https://en.wikipedia.org/wiki/Half-precision_floating-point_format}
*/
var FLOAT16_MAX_SAFE_NTH_LUCAS = 16|0; // asm type annotation


// EXPORTS //

module.exports = FLOAT16_MAX_SAFE_NTH_LUCAS;
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