The C language is essential knowledge in embedded learning, and most operations revolve around C language. Among them, there are three “hard nuts to crack” that are almost universally recognized. 1. Pointers Pointers are recognized as the most difficult concept to understand, and they are a direct reason many beginners choose to give up. The … Read more
What is the essence of the C language? More than 90% of C engineers would definitely say it is pointers. Pointers are something that C engineers both love and hate. They are often a nightmare for many junior engineers, with terms like dangling pointers, wild pointers, and memory leaks… each one can make you lose … Read more
Recommended Reading Understand “Stack Overflow” and “Heap Overflow” in C language with the most straightforward explanation on the internet. GitHub stars: 88.9K, 9 amazing open-source projects! Latest C language interview questions summary PDF detailed version. Do you understand the original code, inverse code, and complement code? From essence to implementation, let’s talk about what C … Read more
1 Introduction to Function Macros Function macros are macro definitions that contain multiple statements, typically encapsulating frequently called functionalities without the overhead of stack operations associated with function calls. Function macros are essentially macros and can be defined directly, for example: #define INT_SWAP(a,b) \ int tmp = a; \ a = b; \ b = … Read more
First, let’s address two questions ◆ What are the differences between pointers and references? ◆ When should we use pointers? When should we use references? Differences between Pointers and References See the code below: A pointer is used to represent a memory address, and this pointer is an integer that is the address of the … Read more
Understanding HashMap in One Image The structure implemented using an array + linked list (chaining method) is shown below:Key Points Recap: HashMap uses an array (buckets), where each bucket stores a conflict linked list (or other structures). The hash function maps the key to a hash value, and then the modulus operation is used to … Read more
1. What is C Language? C language is a general-purpose programming language widely used in low-level development. The design goal of C language is to provide a programming language that can be easily compiled, handle low-level memory, generate minimal machine code, and run without any runtime environment support. Although C language provides many low-level processing … Read more
C language provides a rich set of operators to perform various operations, including arithmetic operations, logical operations, bitwise operations, comparisons, and assignments. Below are the common categories and descriptions of operators in C language: 1. Arithmetic Operators Used for basic mathematical operations: <span>+</span>Addition (e.g., <span>a + b</span>) <span>-</span>Subtraction (e.g., <span>a – b</span>) <span>*</span>Multiplication (e.g., <span>a … Read more
The C Language Chinese Community source code Git repository: https://gitee.com/cyyzwsq/C-Coding.git Recommended reading: Wild Pointers vs Dangling Pointers. Complete source code | C Language Implementation of Student Information Management System. Complete source code | C Language Implementation of Book Management System (Data Persistence Version) source code + design documentation | C Language Implementation of Memory Pool … Read more
Declare a constant using the preprocessor directive #define to indicate how many seconds are in a year (ignoring leap years): #define SECONDS_PER_YEAR (60 * 60 * 24 * 365)UL Write a standard macro MIN that takes two parameters and returns the smaller one: #define MIN(A,B) ((A) <= (B) ? (A):(B)) What is the purpose of … Read more