Programmer Think

1. Network programming (simple code, but deep complexity) Overview of 1.1 Network Programming 1.1.1 Classification Network programming: BIO,NIO,AIO BIO (base): Blocking communication (data flow is limited, waiting for the last batch to be released) (1) In the process of communication, there must be one sender and one receiver. (2) Before ...

Greatest common divisor 1. Seeking the Maximum Common Number Euclidean algorithm-rolling Division (a, b) maximum common divisor gcd(a, b) minimum common divisor lcm(a, b) Theoretical basis: gcd(a, b) = gcd(b, a mod b) //Core Code int gcd(int a, int b) { return b > 0 ? gcd(b, a % b) : a; } AcWing 1246. Equal difference series The math ...

1, Why can Nginx handle it asynchronously and non blocking Look at the whole process of a request: when the request comes, establish a connection, and then receive the data. After receiving the data, send the data. Specifically, the bottom layer of the system is the read-write event. When the read-write event is not re ...

1. Introduction to the QT coordinate system Each window in Qt has a coordinate system. The upper left corner of the default window is the coordinate origin, and then increases horizontally to the right, decreases horizontally to the left, increases vertically to the bottom, and decreases vertically to the top. The origin is the (0, 0) point, i ...

if statement Example 4.1 input the scores of two students a and b, and output the highest score. The preparation procedure is as follows: #include <stdio.h> int main() { float a,b,max; printf("please enter a and b:"); scanf("%f,%f",&a,&b); if(a>=b) max=a; else max=b; printf("max=%6.2f\n",max); ret ...

1, Preface, introductory program, constant, variable 1.1 what is the Java language Java language is a high-level programming language launched by Sun Corporation (Stanford University Network) in 1995. The so-called programming language is the language of the computer. People can use the programming language to give orders to the computer ...

First, let's talk about my version information Operating system MacOS Big Bur 11.2.2 Mysql 8.0.24 Note: I installed it through the official dmg package, not through homebrew. If it is a problem in homebrew installation, it can also be used as a reference. Current date: April 21, 2021 If you want to directly test the results, you can ju ...

Convenient Initialization Previous initializers were called specified initializers (required, no system will generate a default), and convenient initializers Uses of convenient initializers The specified initializer is not to be overlooked. The convenience initializer does work with the specified initializer in the data I have available at t ...

STM32 analog IIC + color recognition TCS34725 1, Hardware parameters 1. Parameters and interfaces VCC3.3/5V power supply positiveGNDPower groundSDAI2C data inputSCLI2C clock input 2, Communication protocol 1.IIC sequence diagram It is known from the I2C sequence diagram that I2C communication, I2C communication, a data line and a clock li ...

1. Anti-shake function (debounce) Purpose: Prevent users from triggering events multiple times and wasting multiple requests Principle: Callback is executed after an event triggers for n seconds; If triggered again within n seconds, the time is recounted; const debounce = function(func,delay = 50){ /* func: Functions requiring ...