Php implementation of Russian multiplication _ PHP Tutorial

Php implements a Russian multiplication instance. This article mainly introduces php to implement Russian multiplication. The example analyzes the principle and code implementation skills of Russian multiplication and has some reference value. The example of php to implement Russian multiplication is required.

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. if you need it, you can refer to it.

This example describes how php implements Russian multiplication. 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:

?

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 will help you with php programming.

This article describes how php achieves Russian multiplication. The example analyzes the principle and code implementation skills of Russian multiplication, which has some reference value and needs...