Example of how php achieves Russian multiplication

This article mainly introduces php's implementation of Russian multiplication. The example analyzes the principle and code implementation skills of Russian multiplication and has some reference value, for more information about how php achieves Russian multiplication, see the example in this article. Share it with you for your reference. The specific analysis is as follows:

I. Overview:

Russian multiplication is an algorithm used to calculate the multiplication of two numbers.
Example:
Computing 35*72
Process
35 72
17 144
8 288
4 576
2 1152
1 2304
For each row from top to bottom, if the number on the left is an odd number, the number on the right is taken out and accumulated.
72 + 144 + 2304 = 2520
The accumulated result 2520 is the product.

II. implementation code:

<? Phpfunction 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 will help you with php programming.