Learning C++ from Scratch Day 2 (C++ Identifiers, Keywords, and Operators) – The Most Comprehensive and Easy-to-Understand Guide

Identifiers In C++, an identifier is a name used to uniquely identify program elements such as variables, functions, classes, objects, and namespaces, making them easier to reference and manipulate in the code. Rules for naming identifiers (must be followed): 1. Composition characters: Identifiers can only consist of letters (A-Z, a-z), digits (0-9), and underscores (_), … Read more

C++ Programming Thinking: Brute Force Enumeration

What is Enumeration AlgorithmThe Enumeration Algorithm, also known as the brute force algorithm, is one of the most intuitive problem-solving methods in computer science. Its core idea is very simple:Systematically traverse all possible solutions, checking each candidate solution one by one to see if it meets the problem’s conditions, until the correct solution is found … Read more

Clue: A Lightweight C++ Logging Library

Clue: A Lightweight C++ Logging Library In C++ development, logging is an important aspect that helps developers better understand the program’s runtime state and quickly locate issues. Clue is a very compact and practical C++ logging library. Introduction Clue is a single-file header library, which means it is very lightweight and easy to use. It … Read more

C++ Practice Questions – Sorting Problem (1)

Time Limit: 2s Memory Limit: 192MB Submissions: 14674 Solved: 9055 Problem Description Sort four integers in ascending order. Input Format Four integers Output Format Output these four numbers in ascending order Sample Input 5 3 4 2 Sample Output 2 3 4 5 Code #include <iostream> #include <algorithm> // for sort function using namespace std; … Read more

C++ Interview Weekly (7): Implementation Principles of unique_ptr and shared_ptr

In C++, manual resource management (<span>new/delete</span>) is prone to errors, leading to: •Memory leaks•Double free•Exception safety issues To address these problems, C++11 introduced smart pointers: •<span>std::unique_ptr</span>: Exclusive ownership•<span>std::shared_ptr</span>: Shared ownership, managed through reference counting We will analyze from three dimensions: principles, performance, and application scenarios. 1. Technical Background and Design Intent 1unique_ptr• Goal: Exclusive resource … Read more

C++ Programming for Kids (19) Algorithm Complexity

Prelude Mathematical Foundations 1. Functions A function is a type of mapping relationship (correspondence/rule). Since it is a mapping relationship, there must be at least two numbers, one of which participates in the mapping, while the other number establishes a relationship with the mapping result. Typically, we use x and y to represent the two … Read more

The Role of Volunteers in Community Activities

Question:What is the role of the volunteers in each of the following activities? What is the role of volunteers in the following activities?1) walking around the town centre（ ）2) helping at concerts（ ）3) getting involved with community groups（ ）4) helping with a magazine（ ）5) participating at lunches for retired people（ ）6) helping with the website（ … Read more

Sun Yingsha: A Natural Leader Since Childhood

I remember the first time I saw a childhood photo of Yingsha; I almost jumped off the sofa. The little girl with the sky-high ponytail stood in the middle of a group of children, exuding an incredible presence that made her instantly recognizable. To be honest, I personally believe that some people are born with … Read more

The Importance and Necessity of Supplementing Vitamin C

As one of the most required nutrients for the human body, Vitamin C has antioxidant properties and enhances immunity. It promotes the formation of antibodies, enhances the phagocytic ability of white blood cells, and improves resistance to diseases, as well as tolerance to cold, thereby strengthening the body’s immune function.In the human body, Vitamin C … Read more