PHP implementation of the Russian multiplication example _php tutorial

PHP implementation of the Russian multiplication example

This article mainly introduces the implementation of the Russian multiplication of PHP, an example of the Russian multiplication principle and code implementation skills, with a certain reference value, the need for friends can refer to the next

In this paper, we explain how to implement the Russian multiplication by PHP. Share to everyone for your reference. The specific analysis is as follows:

First, overview:

Russian multiplication is an algorithm that calculates the multiplication of two numbers.
Examples are as follows:
Calculate 35*72
Process
35 72
17 144
8 288
4 576
2 1152
1 2304
From top to bottom, for each row, if the number on the left is odd, then the number on the right is taken out and accumulated.
72+144+2304=2520
The cumulative result 2520 is the product.

Second, the implementation of code:

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1 2 3 4 5 6 7 8

Function Russian ($m, $n, $res = 0) { (1 = = ($n & 1)) && $res + = $m; $m = $m << 1; $n = $n >> 1; Return $n? Russian ($m, $n, $res): $res; } Echo Russian (7, 8);

I hope this article is helpful to everyone's PHP programming.

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