As a programmer, what was the first programming language you encountered and learned? According to the “2021-2022 China Developer Survey Report,” the long-established assembly language is the most disliked programming language among programmers (37%), followed by C++ (17%) and C (16%). As a machine-oriented programming language, assembly language is indeed very precise, but it is … Read more
Recently, I have seen many analyses about uboot, and to run C language, it is necessary to prepare the stack. In the Uboot’s start.S assembly code, regarding system initialization, I also saw the action of initializing the stack pointer. However, I have only seen people say that system initialization requires initializing the stack, that is, … Read more
In the early days of programming, most applications were partially or entirely written in assembly language. They had to adapt to small memory and run efficiently on slow processors. As memory capacity increased and processor speeds rapidly improved, programs became increasingly complex. Programmers also turned to high-level languages such as C, FORTRAN, COBOL, which offered … Read more
In C/C++ courses and projects, the application of functions is crucial. Here, we have gathered and organized some commonly used functions in C/C++. We hope you can apply them frequently to gain proficiency. 1. Character Processing Functions This category of functions is used for processing individual characters, including character type testing and case conversion. Header … Read more
In 2014, the open-source library OpenSSL, which supports secure transport layer protocols, revealed a shocking vulnerability in its TLS/DTLS Heartbeat extension, which contained a buffer overflow vulnerability. This is the infamous Heartbleed vulnerability. This vulnerability allowed attackers to obtain encrypted data and steal the keys used for encryption. Since OpenSSL is one of the foundational … Read more
In the previous lesson, we dismantled the greatest program in the world, claiming that mastering it means you have grasped 60% of C language. In this lesson, we will discuss some key points related to C language. Review of Last Lesson’s Assignment In the last class, we left an assignment. I wonder if everyone completed … Read more
printf() and scanf() functions are used for input and output operations in C language. These two functions are built-in library functions defined in stdio.h (header file). printf() Function printf() function is used for output operations. It prints the given statement to the console. The syntax of the printf() function is as follows: printf("format string", argument_list); … Read more
Standard header files include: <asset.h> <ctype.h> <errno.h> <float.h> <limits.h> <locale.h> <math.h> <setjmp.h> <signal.h> <stdarg.h> <stddef.h> <stdlib.h><stdio.h> <string.h> <time.h> 1. Standard Definitions (<stddef.h>) The file <stddef.h> contains some common definitions of the standard library, and it is automatically included whenever any standard header file is included. This file defines: Type size_t (the result type of the … Read more
··· Exam Countdown: 36 Days ··· ◣Attention Candidates◥ Scan to Join the Preparation Group for Further Studies Courses/Exam Information/Materials/Benefits, one-on-one Q&A in the group! Key Point 1: Characteristics of C Language Structure 1. A C program consists of functions, and there must be exactly one function named main. 2. A C language function consists of … Read more
1、/*Output the 9*9 multiplication table. There are 9 rows and 9 columns, with i controlling the rows and j controlling the columns.*/ #include “stdio.h” main() {int i,j,result; for (i=1;i<10;i++) { for(j=1;j<10;j++) { result=i*j; printf(“%d*%d=%-3d”,i,j,result);/*-3d means left-aligned, occupying 3 spaces*/ } printf(“\n”);/*Line break after each row*/ } } 2、/*Classical problem: There is a pair of rabbits, … Read more