Writing Ruby Extension Libraries: Steps for Implementing C Language Extensions and Ruby Calls In Ruby, while most development work can be accomplished with pure Ruby code, there are times when we need higher performance or access to low-level system resources. In such cases, we can use C language to write extension libraries. This article will … Read more
This is a very critical and often confused knowledge point in C language: <span>char*</span>, character arrays (such as <span>char str[]</span>), and the relationship between strings. Let’s thoroughly clarify their essence, differences, and connections. 1. Basic Concepts of the Three Term Meaning <span>char*</span> Character pointer, pointing to the address of one (or more) <span>char</span> type variables … Read more
Key Summary：After a function call, the operation is performed on the initialized parameter, not the argument!Function Parameters and ArgumentsIn C language, depending on the different states of the function, the parameters can be roughly divided into two categories: one is formal parameters, and the other is actual parameters.Formal parametersare the parameters declared in the function … Read more
Reverse Engineering of a Parameterless C Function with Return Value in 32-bit Below is a simple example of a C function that does not take any parameters but returns an integer value. Additionally, I provide step-by-step instructions for writing and viewing its assembly code using Visual Studio 2022. C Function #include <stdio.h> // Definition of … Read more
Recommended Advanced Books ↑↑↑ Recommended Reading C Language Dynamic Memory Management: From Beginner to Pro, Understand It All in One Article C Language Pointers: From Beginner to Pro, Understand It All in One Article C Language File Operations: From Beginner to Pro, Understand It All in One Article Top Ten Sorting Algorithms in C Language, … Read more
A Complete Guide to Bit Manipulation in C 1. Basic Concepts of Bit Manipulation Bit manipulation is a technique that directly operates on the binary bits of integers in memory. The C language provides six bitwise operators: 1. Bitwise AND (&): The result is 1 when both corresponding bits of the operands are 1. 2. … Read more
Introduction The C language was born in 1972 and has been around for 47 years, making it quite an old language. However, it remains very popular and continues to rank among the top programming languages, demonstrating remarkable vitality. C is often labeled as <span>procedural</span>, and many students have not considered or practiced developing C code … Read more
In the C language, pointers are one of the most fundamental, powerful, and easily confused concepts. They are not only tools for accessing memory but also play a crucial role in arrays, functions, structures, and many other areas. Below, I will guide you to fully understand the essence, types, uses, and examples of C language … Read more
1. Multiple Choice Questions In the following code snippet, the final value of <span><span>x</span></span> is ( ) int x = 10;x += 5 * 2;x /= 3; A. 5 B. 6 C. 15 D. 20Answer: BExplanation:<span><span>x += 5 * 2</span></span> is equivalent to <span><span>x = x + 5 * 2</span></span>, thus <span><span>x = 10 + … Read more
Dynamic memory allocation in C refers to the process where the program requests memory from the system at runtime, based on its needs, rather than determining the memory size during the compilation phase. This is key to building flexible and scalable programs. Below, I will comprehensively explain the fundamentals of dynamic memory allocation through concepts, … Read more