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php实现俄罗斯乘法实例_PHP

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Release: 2016-05-31 13:13:36
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本文实例讲述了php实现俄罗斯乘法的方法。分享给大家供大家参考。具体分析如下:

一、概述:

俄罗斯乘法是一种计算两数相乘的算法。
举例如下:
计算 35*72
过程
35 72
17 144
8 288
4 576
2 1152
1 2304
从上到下,对每一行,若左边的数字若为奇数,则将右边的数字取出,累加。
72+144+2304=2520
累加的结果2520即为乘积。

二、实现代码:

<&#63;php
function russian($m, $n, $res = 0){
  (1 == ($n & 1)) && $res += $m;
  $m = $m << 1;
  $n = $n >> 1;
  return $n &#63; russian($m, $n, $res) : $res;
}
echo russian(7, 8);
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希望本文所述对大家的php程序设计有所帮助。

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