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- How to use the operation of C language ll and &&&
- && and || operators have short-circuit evaluation characteristics: &&: When the first operand is false, false is returned, and the second operand calculation is skipped. ||: When the first operand is true, return true, skip the second operand calculation. The short circuit feature can avoid meaningless calls to expressions that produce side effects, improve efficiency, and prevent null pointer errors. However, side effects should be taken into account when using it, and short circuit should be disabled if necessary.
- C++ 733 2025-04-03 21:09:01
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- Usage of distinct and matching of distinct and phrase sharing
- DISTINCT is not just a deduplication tool, it can also effectively optimize query performance and process data. Use DISTINCT to count the number of unique rows (COUNT(DISTINCT column_name)), sort by unique rows (DISTINCT column1, column2 ORDER BY column1), and combine index and subquery to optimize performance.
- C++ 972 2025-04-03 21:06:01
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- How to solve the problem of the return value of the c language function being ignored
- The return value of C language function is ignored because programmers lack attention to function design and call, which leads to program logic errors, difficulty in debugging, and even security vulnerabilities. To avoid this "silent disaster", you should carefully check the return value of each function; use assertions to check; design robust functions to provide error handling mechanisms; improve code readability and reduce error occurrence.
- C++ 645 2025-04-03 20:33:01
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- C language starts from 0
- It may be a bit difficult to get started with C language learning, but after mastering the correct method, you will quickly master the basics and gradually master them. This guide will guide you step by step to learn the core concepts of C language, from basics to advanced topics. Directory C language basics and data types User input conditional expression abbreviation switch statement C language array nested loop C language function structure pointer C language basics and data types C programs follow standard structures and use multiple data types to define variables. The basic program structure is as follows: #includeintmain(){printf("hello,world!");ret
- C++ 653 2025-04-03 20:24:02
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- Object-oriented in C? Implementing interfaces from scratch
- This article discusses how to simulate the concept of interfaces in object-oriented programming in C language. We will take the calculation of vehicle prices as an example, implement them in Java and C languages respectively, compare the differences between the two languages, and show how to implement the basic functions of the interface in C. Java implementation: In Java, the interface is defined using the interface keyword, and the class implements the interface through the implements keyword. The sample code is as follows: interfaceVehicle{intprice();}classCarimplementsVehicle{privatefinalintspeed;publi
- C++ 903 2025-04-03 20:21:01
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- About Functions
- Hello! Let me explain functions in a clearer and more standardized way. Question: What is a function? How to use functions? What are the advantages of functions? How many types of functions are there? Answer: What is a function? A function is a reusable block of code that takes input (parameters), performs specific operations, and may return output (return value). This avoids code redundancy and makes the program more modular and easier to maintain and understand. In large projects, functions are crucial because they can break up complex programs into smaller, more manageable parts. How to use functions? The use of a function includes two steps: definition and calling: Definition: This part specifies the function's name, parameter type, return value type, and function body (code block). Your example
- C++ 579 2025-04-03 20:18:01
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- Exercise C: Building a simple phonebook application
- One of the best ways to learn C language programming is to practice it. This article will take you step through a project I recently completed: a simple phonebook application. This app demonstrates file processing and basic data management in C, allowing you to add, view, and delete contacts. The following is the complete code: #include#include//Function declaration voidaddcontact(charname[],charnumber[]);voidviewcontacts();voiddeletecontact(c
- C++ 868 2025-04-03 20:15:01
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- How to protect your API from unauthorized requests
- APIs are the core of modern applications, connecting different systems. However, they are also susceptible to unauthorized access and malicious exploitation. Protecting APIs requires multiple security policies, including CORS authentication, strong authentication, and real-time monitoring. This article will describe several ways to ensure that only trusted clients can access your API. 1. Proper configuration of CORS Cross-domain Resource Sharing (CORS) is a key security mechanism that controls which sources can interact with your API. Correct configuration of CORS can effectively prevent unauthorized access. ASP.NETCore example: builder.Services.AddCors(options=>{options.AddPolic
- C++ 186 2025-04-03 20:12:02
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- Stack Framework and Function Calls: How to Create a CPU Overhead
- I am obsessed with all aspects of computer science and software engineering, and I have a special liking for underlying programming. It is really fascinating to explore the interaction mechanism between software and hardware and analyze their boundary behavior. Even in advanced application programming, this knowledge can help debug and solve problems, such as the use of stack memory. Understanding how stack memory works, especially when interacting with hardware, is critical to avoiding and debugging problems. This article will explore how frequent function calls in a program can lead to overhead and reduce performance. Reading this article requires you to have a certain knowledge base of stack, heap memory and CPU registers. What is a stack framework? Suppose you run a program on your computer. The operating system calls the scheduler, allocates memory to your program, and prepares the CPU to execute instructions. this
- C++ 212 2025-04-03 20:09:02
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- Assign strings in C
- Let's analyze these two C codes and see why they behave so much. Code example 1: #includeintmain(void){char*string="wello,world!";string[0]='h';puts(string);} This code declares a character pointer string and initializes it to point to a string literal "wello,world!". String literals are usually stored in read-only data segments of the program. Trying to modify string[0] will try to
- C++ 552 2025-04-03 20:06:02
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- libv are two
- I developed a project called Lua-Libuv and am happy to share my experience. The original intention of the project is to explore how to use Libuv (an asynchronous I/O library written in C) to build a simple HTTP server without having to learn the C language in depth. With the help of ChatGPT, I completed the basic code of HTTP.C. When dealing with persistent connections, I successfully implemented closing the connection and freeing resources at the right time. At first I tried to create a simple server that ended the main program by closing the connection, but I had some problems. I've tried sending blocks of data using streaming, and while it works, this blocks the main thread. In the end, I decided to give up on this approach because my goal was not to learn C language in depth. Finally, I
- C++ 941 2025-04-03 20:03:01
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- Unique shared library issues
- Problem Description Recently, I encountered a link error when I tried to link a self-built C language shared library to a local project, and I encountered a link error, prompting "Undefined reference". The error message is as follows: /bin/ld:/tmp/cchb7mj8.o:infunction`sdl_main':main.c:(.text 0x3c):undefinedreferenceto`sdl_enterappmaincallbacks'...(other similar undefined references)..collect2:error:ldreturned1exitstatusmake:***[
- C++ 237 2025-04-03 20:00:03
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- C Programmer &#s Undefined Behavior Guide
- Exploring Undefined Behaviors in C Programming: A Detailed Guide This article introduces an e-book on Undefined Behaviors in C Programming, a total of 12 chapters covering some of the most difficult and lesser-known aspects of C Programming. This book is not an introductory textbook for C language, but is aimed at readers familiar with C language programming, and explores in-depth various situations and potential consequences of undefined behaviors. Author DmitrySviridkin, editor Andrey Karpov. After six months of careful preparation, this e-book finally met with readers. Printed versions will also be launched in the future. This book was originally planned to include 11 chapters, but during the creation process, the content was continuously enriched and finally expanded to 12 chapters - this itself is a classic array out-of-bounds case, and it can be said to be every C programmer
- C++ 581 2025-04-03 19:57:01
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- Meson: Use out-of-nothing GIT projects as dependencies
- Meson project dependency processing: Cleverly solves the dependency problem of Git project without Meson.build files. Many excellent Git projects lack Meson.build files, which poses challenges for developers who use Meson build systems. This article will introduce a way to solve this problem by creating a patch file and successfully add a Git project without the Meson.build file to your Meson project as a subproject. Suppose you need to add the benhoyt/ht project (which does not have a Meson.build file) to your project as a subproject. You can use Meson's wrap mechanism, but you need to manually add the Meson.build article
- C++ 810 2025-04-03 19:54:01
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- C test coverage in C IS will teach you how to use it
- Software Test Coverage: The key to ensuring code quality is in software development, testing is crucial, it ensures that the software runs as expected. The test coverage further ensures the comprehensiveness of the test and ensures that all branches and paths of the code are tested. Many modern programming languages provide libraries or tools to generate test coverage reports, but did you know that C also has a "native" tool? Let's start with a simple C function that returns ±42: #includeinreturn_42(boolret_neg){if(ret_neg)return-42;return42;}
- C++ 179 2025-04-03 19:51:01
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