Programmer Think

1, Foreword To understand the registration mechanism, first we need to have a certain understanding of function pointers and callback functions. My previous blog has explained in detail: Detailed explanation of C language callback function (the most complete in the whole network) 2, Registration mechanism 1. Problem description In the ...

"Wuji, how much do you remember what I taught you?" "Master Hui, I only remember more than half." "And now?" "There is less than half left." "And now?" "I've forgotten everything!" "OK, you can go!" Envy Zhang Wuji, forget his martial arts and defeat the enemy; I forgot my ...

Which course does this assignment belong tohttps://bbs.csdn.net/forums/csuft_swxy_C?typeId=17321What are the requirements for this assignmenthttps://bbs.csdn.net/topics/603427602The goal of this assignmentWrite code with a for loopStudent number20218534 1, Homework this week (40 points in total) 1.1 complete PTA homework and give a screenshot ...

1, Constructor         1. How the constructor looks                 (1) . the function name and class name are the same                 (2) . no return value class Person { public: Person(){}//Constructor -- > has no return value prote ...

pthread Queue for thread synchronization Original link https://www.foxzzz.com/queue-with-thread-synchronization/ In recent days, pthread needs to be used to implement a Queue with thread synchronization function. In the process, two pits are stepped on: pthread_cond_wait() needs to be placed in pthread_mutex_lock() and pthread_mutex_unlock( ...

3, Relational database standard query language SQL 1, SQL overview (1) Composition of SQL language 1. Data definition (DDL) ——Define the logical structure of the database, including basic tables, views, indexes, etc 2. Data manipulation (DML) ——It includes query and update, and update also includes insertion, delet ...

preface Due to the requirements for OpenCV version, you need to uninstall OpenCV3.4 and reinstall version 4.4.0. Note: ROS originally had its own OpenCV. Remember not to delete it, but only delete your own additional library, otherwise some function packages in ROS will collapse because you can't find the original OpenCV. I can't find ...

2 - branch and loop statements 1. Branch statement if switch 2. Circular statement while for do while 3. goto statement (jump statement) 1. What is a statement? C statements can be divided into the following five categories: Expression statementFunction call statementControl statementCompound statementEmpty statement Control statements a ...

1, Lattice font principle 1. Chinese character coding 1.1 location code The national standard GD2312-80 stipulates that all national standard Chinese characters and symbols are allocated in a square matrix with 94 rows and 94 columns. Each row of the square matrix is called an "area", numbered from 01 to 94, and each column is call ...

Personal questions:   1. This minesweeping function calculates several surrounding mines. Can the return value be a character? Why do you have to subtract 8 characters from zero to become a number?          A: what you want is the number of Lei, and the array is all character 1. Subtracting cha ...