国产av日韩一区二区三区精品,成人性爱视频在线观看,国产,欧美,日韩,一区,www.成色av久久成人,2222eeee成人天堂

Home php教程 php手冊(cè) 僅用自增自減運(yùn)算實(shí)現(xiàn)加減乘除

僅用自增自減運(yùn)算實(shí)現(xiàn)加減乘除

Jun 06, 2016 pm 07:35 PM
Addition, subtraction, multiplication and division accomplish Decrease self-increasing Operation

閑著無(wú)聊,突發(fā)奇想,可不可以不用“+-*/”來(lái)實(shí)現(xiàn)四則運(yùn)算呢。折騰了一下,發(fā)現(xiàn)還是很多方法可以實(shí)現(xiàn)的,比如僅用自增自減運(yùn)算來(lái)實(shí)現(xiàn)。不過(guò)由于自增自減是以1為基礎(chǔ)單位運(yùn)算的,所以這里參與運(yùn)算的參數(shù)只考慮整數(shù)情況。首先是加法運(yùn)算,定義一個(gè)函數(shù)add(),返

閑著無(wú)聊,突發(fā)奇想,可不可以不用?“+?-?*?/”?來(lái)實(shí)現(xiàn)四則運(yùn)算呢。折騰了一下,發(fā)現(xiàn)還是很多方法可以實(shí)現(xiàn)的,比如僅用自增自減運(yùn)算來(lái)實(shí)現(xiàn)。不過(guò)由于自增自減是以1為基礎(chǔ)單位運(yùn)算的,所以這里參與運(yùn)算的參數(shù)只考慮整數(shù)情況。首先是加法運(yùn)算,定義一個(gè)函數(shù)add(),返回兩個(gè)參數(shù)的和。
//首先是加法運(yùn)算,定義一個(gè)函數(shù)add(),返回兩個(gè)參數(shù)的和,參數(shù)也可以是負(fù)數(shù)哦。

function add($a,$b){   
    while($b!=0){   
        if($b>0){   
            $b--;   
            $a++;   
        }else{   
            $b++;   
            $a--;   
        }   
    }   
    return $a;   
}   
echo add(11,12);  
//下面是減法運(yùn)算,定義函數(shù)為sub()。和加法運(yùn)算是逆運(yùn)算,代碼相似度高達(dá)99.9%。

function sub($a,$b){   
    while($b!=0){   
        if($b>0){   
            $b--;   
            $a--;   
        }else{   
            $b++;   
            $a++;   
        }   
    }   
    return $a;   
}   
echo sub(11,12);  
//然后是乘法運(yùn)算,比加減運(yùn)算復(fù)雜一點(diǎn)點(diǎn),其實(shí)就是多次加法運(yùn)算,代碼如下:

function multi($a,$b){   
    $r = 0;   
    if($a==0 && $b==0)  return $r;   
    while($b!=0){   
        $i=0;   
        if($b>0){   
            $b--;          
            while($i!=$a){   
                if($a>0){   
                    $i++;   
                    $r++;   
                }else{   
                    $i--;   
                    $r--;   
                }   
            }   
        }else{   
            $b++;   
            while($i!=$a){   
                if($a>0){   
                    $i++;   
                    $r--;   
                }else{   
                    $i--;   
                    $r++;   
                }   
            }   
        }   
    }   
    return $r;   
}   
echo multi(11,12);  
//最后是除法運(yùn)算,除法是乘法的逆運(yùn)算,但是為了保證參數(shù)和運(yùn)算結(jié)果都在整數(shù)范圍內(nèi),我將除法的函數(shù)簡(jiǎn)化了參數(shù)范圍。范圍是正整數(shù),并且第二個(gè)參數(shù)不能為0,參數(shù)最好是整除的。

function divis($a,$b){   
    if($a<0 || $b<=0 ) return 'error';   
    $r = 0;   
    while($a>0){   
        $i=0;   
        while($i!=$b){   
            $i++;   
            $a--;   
        }   
        if($a<0) break;//防止不整除的情況   
        $r++;   
    }   
    return $r;   
}   
echo divis(22,2);  
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undress AI Tool

Undress AI Tool

Undress images for free

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

How to implement dual WeChat login on Huawei mobile phones? How to implement dual WeChat login on Huawei mobile phones? Mar 24, 2024 am 11:27 AM

How to implement dual WeChat login on Huawei mobile phones? With the rise of social media, WeChat has become one of the indispensable communication tools in people's daily lives. However, many people may encounter a problem: logging into multiple WeChat accounts at the same time on the same mobile phone. For Huawei mobile phone users, it is not difficult to achieve dual WeChat login. This article will introduce how to achieve dual WeChat login on Huawei mobile phones. First of all, the EMUI system that comes with Huawei mobile phones provides a very convenient function - dual application opening. Through the application dual opening function, users can simultaneously

PHP Programming Guide: Methods to Implement Fibonacci Sequence PHP Programming Guide: Methods to Implement Fibonacci Sequence Mar 20, 2024 pm 04:54 PM

The programming language PHP is a powerful tool for web development, capable of supporting a variety of different programming logics and algorithms. Among them, implementing the Fibonacci sequence is a common and classic programming problem. In this article, we will introduce how to use the PHP programming language to implement the Fibonacci sequence, and attach specific code examples. The Fibonacci sequence is a mathematical sequence defined as follows: the first and second elements of the sequence are 1, and starting from the third element, the value of each element is equal to the sum of the previous two elements. The first few elements of the sequence

PHP Game Requirements Implementation Guide PHP Game Requirements Implementation Guide Mar 11, 2024 am 08:45 AM

PHP Game Requirements Implementation Guide With the popularity and development of the Internet, the web game market is becoming more and more popular. Many developers hope to use the PHP language to develop their own web games, and implementing game requirements is a key step. This article will introduce how to use PHP language to implement common game requirements and provide specific code examples. 1. Create game characters In web games, game characters are a very important element. We need to define the attributes of the game character, such as name, level, experience value, etc., and provide methods to operate these

Master how Golang enables game development possibilities Master how Golang enables game development possibilities Mar 16, 2024 pm 12:57 PM

In today's software development field, Golang (Go language), as an efficient, concise and highly concurrency programming language, is increasingly favored by developers. Its rich standard library and efficient concurrency features make it a high-profile choice in the field of game development. This article will explore how to use Golang for game development and demonstrate its powerful possibilities through specific code examples. 1. Golang’s advantages in game development. As a statically typed language, Golang is used in building large-scale game systems.

How to implement the WeChat clone function on Huawei mobile phones How to implement the WeChat clone function on Huawei mobile phones Mar 24, 2024 pm 06:03 PM

How to implement the WeChat clone function on Huawei mobile phones With the popularity of social software and people's increasing emphasis on privacy and security, the WeChat clone function has gradually become the focus of people's attention. The WeChat clone function can help users log in to multiple WeChat accounts on the same mobile phone at the same time, making it easier to manage and use. It is not difficult to implement the WeChat clone function on Huawei mobile phones. You only need to follow the following steps. Step 1: Make sure that the mobile phone system version and WeChat version meet the requirements. First, make sure that your Huawei mobile phone system version has been updated to the latest version, as well as the WeChat App.

How to implement exact division operation in Golang How to implement exact division operation in Golang Feb 20, 2024 pm 10:51 PM

Implementing exact division operations in Golang is a common need, especially in scenarios involving financial calculations or other scenarios that require high-precision calculations. Golang's built-in division operator "/" is calculated for floating point numbers, and sometimes there is a problem of precision loss. In order to solve this problem, we can use third-party libraries or custom functions to implement exact division operations. A common approach is to use the Rat type from the math/big package, which provides a representation of fractions and can be used to implement exact division operations.

Using PHP to implement SaaS: a comprehensive analysis Using PHP to implement SaaS: a comprehensive analysis Mar 07, 2024 pm 10:18 PM

I'm really sorry that I can't provide real-time programming guidance, but I can provide you with a code example to give you a better understanding of how to use PHP to implement SaaS. The following is an article within 1,500 words, titled "Using PHP to implement SaaS: A comprehensive analysis." In today's information age, SaaS (Software as a Service) has become the mainstream way for enterprises and individuals to use software. It provides a more flexible and convenient way to access software. With SaaS, users don’t need to be on-premises

Analysis and solutions to PHP floating point operation problems Analysis and solutions to PHP floating point operation problems Feb 27, 2024 am 11:03 AM

PHP is a scripting language widely used in website development. Its powerful functions and flexibility make it the tool of choice for many developers. However, PHP also has some problems when dealing with floating point operations, especially when it comes to precision and accuracy. This article will analyze PHP floating point operation problems and propose some solutions. It will also provide specific code examples to help readers better understand and solve these problems. Problem Analysis In PHP, floating point numbers are a data type used to represent decimals.

See all articles