PHP implementation of Russian multiplication examples

Source: Internet
Author: User

This article mainly introduced the PHP to realize the Russian multiplication, the example analysis Russian multiplication principle and the code realization Skill, has certain reference value, the need friend may refer to the next

This article illustrates the method of Russian multiplication in 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
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 right side of the number out, add.
The cumulative result of 2520 is the product.

Second, the implementation code:

1 2 3 4 5 6 7 8 <?php function Russian ($m, $n, $res = 0) {(1 = ($n & 1)) && $res + = $m; $m = $m << 1; $n = $n >&G T 1; Return $n? Russian ($m, $n, $res): $res; } Echo Russian (7, 8);

I hope this article will help you with your PHP program design.

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