Backend Development
PHP Tutorial
PHP algorithm exercise 2: Find the absolute difference between n and the specified number
PHP algorithm exercise 2: Find the absolute difference between n and the specified number
In "PHP Algorithm Exercise 1: Calculate the sum of two numbers and three times the sum", I introduced you to the first question of PHP arithmetic exercise. I believe everyone has mastered it. So the theme of today’s article is somewhat similar to it, I hope everyone can master it quickly!
We used to find the sum, now we find the difference, let’s do it one by one~
The specific question of this article is "Write a PHP program to get the absolute difference between n and the specified value .If n is greater than this specified value, three times the absolute difference is returned."
You can practice it locally, and then look at my method below:
The PHP code is as follows:
<?php
function test($n)
{
$x = 50;
if ($n > $x)
{
return ($n - $x)*3;
}
return $x - $n;
}
echo test(53)."<br>";
echo test(30)."<br>";
echo test(50)."<br>";The output calculation result is:
In the above code, the specified value we gave is 50, and then the if statement is used to determine whether n is greater than 50. If n is greater than 50, three times the absolute difference is returned, otherwise it is returned its absolute difference. The key arithmetic code parts here are "($n - $x)*3;" and "$x - $n;".
In this example, the first n we gave is 53, then 53 is greater than 50, and the result is naturally to return (53-50)*3=9;
The second one n is 30, which is less than 50, and the result is "50-30=20";
The third n is 50, which is equal to 50, and the result is naturally 0.
In the above code, a function is used to customize a test method. Needless to say, it mainly depends on the understanding and mastery of if judgment statements and PHP operators.
A brief introduction to the conditional statements provided in PHP:
if 语句 - 在条件成立时执行代码 if...else 语句 - 在条件成立时执行一块代码，条件不成立时执行另一块代码 if...elseif....else 语句 - 在若干条件之一成立时执行一个代码块 switch 语句 - 在若干条件之一成立时执行一个代码块
Finally, I would like to recommend the latest free course on our platform "Entering the World of PHP from 0" ~Come and learn!
The above is the detailed content of PHP algorithm exercise 2: Find the absolute difference between n and the specified number. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1672
14
1428
52
1332
25
1276
29
1256
24
PHP vs. Python: Understanding the Differences
Apr 11, 2025 am 12:15 AM
PHP and Python each have their own advantages, and the choice should be based on project requirements. 1.PHP is suitable for web development, with simple syntax and high execution efficiency. 2. Python is suitable for data science and machine learning, with concise syntax and rich libraries.
PHP: A Key Language for Web Development
Apr 13, 2025 am 12:08 AM
PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7
PHP and Python: Comparing Two Popular Programming Languages
Apr 14, 2025 am 12:13 AM
PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.
PHP in Action: Real-World Examples and Applications
Apr 14, 2025 am 12:19 AM
PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.
The Enduring Relevance of PHP: Is It Still Alive?
Apr 14, 2025 am 12:12 AM
PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.
PHP and Python: Different Paradigms Explained
Apr 18, 2025 am 12:26 AM
PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.
PHP vs. Other Languages: A Comparison
Apr 13, 2025 am 12:19 AM
PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.
PHP and Python: Code Examples and Comparison
Apr 15, 2025 am 12:07 AM
PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.
