icy2003 /
php
| Total Complexity | 12 |
| Total Lines | 58 |
| Duplicated Lines | 0 % |
| Coverage | 100% |
| Changes | 1 | ||
| Bugs | 0 | Features | 0 |
| 1 | <?php |
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| 16 | trait FMAT |
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| 17 | { |
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| 18 | /** |
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| 19 | * 返回数的阶乘 |
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| 20 | * |
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| 21 | * @param integer|double $number 必需。 要计算其阶乘的非负数。 如果 number 不是整数，将被截尾取整 |
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| 22 | * |
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| 23 | * @return integer|false |
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| 24 | */ |
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| 25 | 4 | public static function fact($number) |
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| 26 | { |
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| 27 | 4 | $number = (int) floor($number); |
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| 28 | 4 | if ($number == 0) { |
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| 29 | 1 | return 1; |
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| 30 | 4 | } elseif ($number < 0) { |
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| 31 | 1 | return false; |
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| 32 | } |
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| 33 | 4 | $result = 1; |
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| 34 | 4 | foreach (Arrays::rangeGenerator(1, $number) as $num) { |
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| 35 | 4 | $result *= $num; |
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| 36 | } |
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| 37 | 4 | return $result; |
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| 38 | } |
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| 39 | |||
| 40 | /** |
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| 41 | * 返回数字的双倍阶乘 |
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| 42 | * |
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| 43 | * - 偶数：n!! = n * (n - 2) * (n - 4) * ... * 4 * 2 |
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| 44 | * - 奇数：n!! = n * (n - 2) * (n - 4) * ... * 3 * 1 |
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| 45 | * |
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| 46 | * @param integer $number 必需。 为其返回双倍阶乘的值。 如果 number 不是整数，将被截尾取整 |
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| 47 | * |
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| 48 | * @return integer |
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| 49 | */ |
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| 50 | 1 | public static function factdouble($number) |
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| 51 | { |
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| 52 | 1 | if ($number == 0) { |
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| 53 | 1 | return 1; |
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| 54 | } |
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| 55 | 1 | $result = 1; |
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| 56 | 1 | $isEven = $number % 2 == 0; |
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| 57 | 1 | foreach (Arrays::rangeGenerator($isEven ? 2 : 1, (int) $number, 2) as $num) { |
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| 58 | 1 | $result *= $num; |
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| 59 | } |
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| 60 | 1 | return $result; |
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| 61 | } |
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| 62 | |||
| 63 | /** |
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| 64 | * 将参数 number 向下舍入（沿绝对值减小的方向）为最接近的 significance 的倍数 |
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| 65 | * |
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| 66 | * @param double $number 必需。 要舍入的数值 |
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| 67 | * @param double $significance 必需。 要舍入到的倍数 |
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| 68 | * |
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| 69 | * @return double|false |
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| 70 | */ |
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| 71 | 1 | public static function floor($number, $significance = 1) |
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| 74 | } |
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| 75 | } |
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| 76 |
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