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1<?php
2/**
3 * Jingga
4 *
5 * PHP Version 8.1
6 *
7 * @package   phpOMS\Math\Number
8 * @copyright Dennis Eichhorn
9 * @license   OMS License 2.0
10 * @version   1.0.0
11 * @link      https://jingga.app
12 */
13declare(strict_types=1);
14
15namespace phpOMS\Math\Number;
16
17/**
18 * Numbers class.
19 *
20 * @package phpOMS\Math\Number
21 * @license OMS License 2.0
22 * @link    https://jingga.app
23 * @since   1.0.0
24 */
25final class Numbers
26{
27    public const SFLOAT = 1.175494351E-38;
28
29    public const EPSILON = 4.88e-04;
30
31    /**
32     * Constructor.
33     *
34     * @since 1.0.0
35     * @codeCoverageIgnore
36     */
37    private function __construct()
38    {
39    }
40
41    /**
42     * Is perfect number?
43     *
44     * @param int $n Number to test
45     *
46     * @return bool
47     *
48     * @since 1.0.0
49     */
50    public static function isPerfect(int $n) : bool
51    {
52        $sum = 0;
53
54        for ($i = 1; $i < $n; ++$i) {
55            if ($n % $i == 0) {
56                $sum += $i;
57            }
58        }
59
60        return $sum === $n;
61    }
62
63    /**
64     * Is self describing number?
65     *
66     * @param int $n Number to test
67     *
68     * @return bool
69     *
70     * @since 1.0.0
71     */
72    public static function isSelfdescribing(int $n) : bool
73    {
74        $n     = (string) $n;
75        $split = \str_split($n);
76
77        if ($split === false) {
78            return false; // @codeCoverageIgnore
79        }
80
81        foreach ($split as $place => $value) {
82            if (\substr_count($n, (string) $place) != $value) {
83                return false;
84            }
85        }
86
87        return true;
88    }
89
90    /**
91     * Is square number?
92     *
93     * @param int $n Number to test
94     *
95     * @return bool
96     *
97     * @since 1.0.0
98     */
99    public static function isSquare(int $n) : bool
100    {
101        return \abs(((int) \sqrt($n)) * ((int) \sqrt($n)) - $n) < self::EPSILON;
102    }
103
104    /**
105     * Count trailling zeros
106     *
107     * @param int $n Number to test
108     *
109     * @return int
110     *
111     * @since 1.0.0
112     */
113    public static function countTrailingZeros(int $n) : int
114    {
115        $count = 0;
116        while ($n !== 0) {
117            if (($n & 1) === 1) {
118                break;
119            }
120
121            ++$count;
122            $n >>= 1;
123        }
124
125        return $count;
126    }
127}