In the previous article, we discussed the declaration and definition of pointers and other basic concepts. However, our understanding of pointers is still insufficient, so in this lesson, we will continue to learn about pointers. To reinforce our understanding, let’s first look at a classic pointer example code. Can you find the correct answer?Question: Now … Read more
Input Events to State Machine #include "stdio.h" #define EXECUTE_VOID(func) {if((func)!=NULL) (func());} typedef void(*select_machine_t)(void); typedef enum _event_index{ event_index_1 = 0, event_index_2, event_index_3, event_index_end} event_index_e; typedef enum _status_index{ status_index_1 = 0, status_index_2, status_index_end} status_index_e; void machine_1(void); void machine_2(void); void machine_3(void); void machine_4(void); select_machine_t select_machine[event_index_end][status_index_end] = { {machine_1, machine_2}, {NULL, machine_3}, {machine_4, NULL}}; void machine_1(void){ printf("machine_1\r\n"); } void … Read more
01 (Common Mistakes) Answer: D Explanation: For option C: Memory addresses can be accessed directly through pointers. For option D: Although there is no strict limit on the number of statements within a function in C, it is actually constrained by the compiler or system resources. 02 Answer: C Explanation: Omitted 03 Answer: A Explanation: … Read more
Today, I studied callback functions and recorded some of my thoughts based on articles from experts online. I will continue to write about the subsequent topics. What is a callback function? A callback function is a function that is called through a function pointer. If you pass the pointer (address) of a function as a … Read more
Author:PhyJack https://www.cnblogs.com/phyjack/p/18445368 Overview This article provides a detailed introduction to pointers of ordinary functions and member functions of classes in C/C++. It explains practical techniques for using function pointers as inputs to other functions, return values, and how typedef can enhance code readability, illustrated with C++ code examples. For member function pointers of classes, the … Read more
In C, a function pointer is a special type of pointer that can store the address of a function. With function pointers, we can flexibly call different functions, thereby enhancing the flexibility and scalability of the program. This article will introduce the basic definition of function pointers, how to use them, and some common application … Read more
Today, I will explain pointers. From basic to advanced, this article will combine practical applications to help you learn pointers while understanding what experts use pointers for!Long article warning! The entire text is about 5200 words, and this article is enough to learn pointers!Many people, like me when I first learned C language, are afraid … Read more
I remember when I first started working, a senior developer told me that if you are not familiar with longjmp and setjmp, you shouldn’t call yourself a C language expert. At that time, I was skeptical, but to advance my skills, I spent some time learning how to use longjmp and setjmp. Later, I realized … Read more
Function pointers are a powerful feature in the C programming language, allowing programs to pass, store, and dynamically call functions as data, providing great flexibility in code design. This article will systematically explain function pointers from their definition syntax, basic usage to advanced applications (callback mechanisms, state machines, plugin systems, object-oriented simulation), combining core insights … Read more
This article provides a detailed analysis of declarations in the C language, progressing step by step to thoroughly resolve this challenging topic. It is highly recommended to bookmark it. Pre-Class Question? What does the following declaration mean? char *const *(*next)(); First, give your answer. The standard answer will gradually become clear throughout this article’s step-by-step … Read more
