1. The typedef Keyword In C language, the typedef keyword is used to define a new name (alias) for an existing data type. It does not create a new data type but provides a more readable and concise identifier for existing types, thereby improving code readability and maintainability. The basic syntax of typedef is very … Read more
1. Static Functions, Const Functions, and Virtual Functions Static Functions Static functions cannot be defined as virtual functions. They belong to the class itself, not to instances of the class, and do not have a <span>this</span> pointer. Virtual function calls depend on the object’s virtual function table, requiring the <span>this</span> pointer for location, while static … Read more
Implementation Methods and Examples of Polymorphism in C Language In object-oriented programming, polymorphism is an important concept that allows the same method to be called in different forms through various means. In C language, although there is no direct syntax support for polymorphism, we can achieve similar effects through the following methods: function pointers, combinations … Read more
Decorator Pattern: Implementation and Advantages in C Language The Decorator Pattern is a structural design pattern that allows adding new functionality to existing objects without altering their structure. This flexible design enables programmers to dynamically add additional responsibilities or behaviors to an object at runtime. The decorator pattern is particularly important when there is a … Read more
Three Essential Elements of a Function Functionality, Parameters, Return Value. 1. Function Exercises 1. Define four functions to implement the operations of two integers: +, -, *, / my_add my_sub my_mul my_div After writing, test the functionality yourself. #include <stdio.h> int my_add(int x, int y); int my_sub(int x, int y); int my_mul(int x, int y); … Read more
#include <stdio.h> #include <string.h> #include <ctype.h> typedef void (*funcPtr)(char *); // 1. Remove leading and trailing whitespace (similar to Python's strip) void trim(char *str) { int i = 0, j; int len = strlen(str); // Remove leading whitespace while (isspace(str[i])) i++; // Remove trailing whitespace j = len – 1; while (j >= 0 && … Read more
In embedded development, struct encapsulation function pointers are powerful tools for improving code quality, but a flawed design can lead to disaster. This article guides you through correcting typical error cases and mastering engineering-level implementation solutions. 1. Analysis of Typical Error Cases The code provided by the developer has three fatal issues: // Problematic code … Read more
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1. A pipeline can achieve maximum efficiency only when it is filled with instructions, meaning that one instruction is executed per clock cycle (this refers only to single-cycle instructions). If a jump occurs in the program, the pipeline will be cleared, and it will take several clock cycles to refill the pipeline. Therefore, minimizing the … 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 machine_2(void){ printf("machine_2\r\n");} void … Read more