Author: Rahul

Hello friends! Today we talk about a very famous math rule called Pythagoras Theorem. This theorem is super old, like thousands of years old, and it was made by a man named Pythagoras from Greece. He was a smart guy who loved math. This theorem is used in triangles, but not any triangle, only special ones called right-angled triangles. If you study math in school or need to solve problems about triangles, this theorem is like your best friend! Let’s learn it in simple way. Definition Okay, so what is Pythagoras Theorem? the definition is: In a right-angled triangle, the…

In the world of shell scripting, efficient string manipulation is a crucial skill. Being able to replace one substring with another in a given string can significantly enhance the functionality and flexibility of your bash scripts. In this article, we will explore a detailed guide on how to accomplish substring replacement in Bash scripts, accompanied by practical examples. Prerequisites Before diving into substring replacement, it is important to have a basic understanding of Bash scripting and familiarity with string manipulation concepts. Step 1: Defining the String and Substring The first step is to define the original string and the substring…

Wget is a free and powerful utility available for most Unix-like operating systems, including Linux, Mac, and Windows via Cygwin. It allows you to retrieve files and web pages from servers using various protocols, such as HTTP, HTTPS, and FTP. However, there may be situations where you want to download files from HTTPS sites, but the site’s SSL certificate isn’t recognized, is expired, or is self-signed. It’s usually safer to fix the underlying issue causing the SSL error. But, if you are sure about the site’s authenticity, you might want to bypass or ignore SSL certificate checks with Wget. In…

When working with Curl in applications that connect to servers via SSL or HTTPS, verifying the SSL certificate of the server is a default functionality. This ensures that the communication is secure and that the server is who it claims to be. However, there might be situations where ignoring or bypassing SSL certificate checks is necessary, such as in a development environment, testing, or when dealing with self-signed certificates. This article presents a detailed walkthrough on how to achieve this with Curl. Please note: Ignoring SSL certificate checks can expose your application to security risks such as man-in-the-middle attacks. Always…

Bash scripting is a powerful tool for automating tasks and creating complex workflows in the Linux environment. One of the key features of bash scripting is the ability to define and call functions. Functions allow you to encapsulate a set of commands and execute them as a single unit, providing modularity and reusability to your scripts. In this article, we will explore how to call a bash function and retrieve its return values. Defining a Bash Function Before we dive into calling a function and retrieving its return values, let’s first understand how to define a bash function. Functions in…

Python, a high-level interpreted language, is well-known for its simplicity and readability. One of the core principles of Python is that “There should be one– and preferably only one –obvious way to do it.” This clarity and emphasis on simplicity extend to Python’s function definition and call syntax. In this article, we will look at a detailed example of how to define a function in Python, call it, and retrieve the return value. What is a Function in Python? A function represents a segment of code designed for reusability that carries out a particular action. By enhancing the modular structure…

In this article, we will explore a simple yet interesting problem: how to reverse a number in Java. This problem is common in beginner-level programming exercises and tests. It helps learners understand basic Java constructs, control flow, and arithmetic operations. The solution involves getting each digit of the number and arranging these digits in the reverse order. Approach To reverse a number in Java, we use the modulus (%) and integer division (/) operations. Modulus (%) operation: In Java, the modulus operation finds the remainder after division of one number by another (also called divisor). For example, `10 % 3`…

When working with Laravel, a popular PHP framework, you may encounter various challenges. One such issue pertains to encryption, which is a critical aspect of securing data within web applications. Laravel uses OpenSSL for encryption and supports specific ciphers, namely AES-128-CBC, AES-256-CBC, AES-128-GCM, and AES-256-GCM. If you try to use an unsupported cipher or an incorrect key length, Laravel will throw an error. In this document, we discuss such an error and outline steps to rectify it. The Error When trying to utilize Laravel’s Encrypter, you may come across an error message like this: Unsupported cipher or incorrect key length.…

A bash script is a plain text file that contains a series of commands. These commands are a sequence of orders for a UNIX-based operating system to run. This script can be executed in two ways: by executing the script file as an input to the bash command, or by specifying the script file as an executable file. In this article, we’ll illustrate how to create a bash script that reverses a given number. For example, if the input is `12345`, the script will output `54321`. Let’s dive in. Bash Script Below is the bash script for reversing a number:…

In the world of programming, there are multiple problems that can be solved in various ways, depending on the chosen approach and the programming language used. One such problem is reversing a number, which is a common task given to beginners in the field of programming. This article will present a step-by-step guide on how to write a program in C that reverses a given number. C is a general-purpose programming language that provides low-level access to memory and is crucial in the field of systems programming. Problem Statement The task is to create a C program that takes a…