Programmer Think

01 Preface Hello everyone, this article is Special topic of iOS/Android audio and video development The seventh article, the AVPlayer project code will be hosted in Github, and you can get back the data in the background of WeChat official account (GeekDev) to get the project address. In the last article OpenGL ES realizes playing video frame ...

class There are many kinds of life, human, birds, animals and so on. These classes have properties and capabilities that they all share. Then we can use classes to define a human, in which an instantiated variable of human is called an object. 1. Role of class Similar to a function combining a piece of code, a class can combine variables ...

Format inputscanf functionGeneral form: scanf (format control, address list)The format control is consistent with the format control of printf functionThe address list can be the address of a variable or the first address of a stringTipsUsing the scanf function directly in the vs new compiler will prompt a warning and cannot be operated, and sc ...

Basic principles Simulation principle MMIO Memory, memory mapped I / O memory, is a memory type defined by QEMU/KVM. Like ordinary RAM Memory, MMIO Memory in Guest also represents a memory area. It is also volatile storage.The difference between MMIO Memory and RAM Memory is that when the Guest reads and writes the memory represented by M ...

Sort array collapse array de redo callback function Bubble sorting significance It is to adjust an out of order array into an ordered array through the execution of code Logic: ​ 1. Traverse the array, compare two by two, and move the relatively large number backward ​ 2. After traversing, the result is that the largest number must be a ...

4, Hash 1. 242 effective letter ectopic words Given two strings s and t, write a function to judge whether t is an alphabetic ectopic word of s. Note: if each character in S and t appears the same number of times, s and T are called alphabetic words. Source: LeetCode Link: https://leetcode-cn.com/problems/valid-anagram The copyright be ...

1. Installation test CMake can also specify installation rules and add tests. These two functions can be executed by using make install and make test after generating makefile. In GNU Makefile, you may need to write install and test pseudo targets and corresponding rules for this, but in CMake, such work also needs to simply call a few command ...

NodeJS backend development 08 log using log4js What is a log? Like keeping a diary, the log is printed out by the program, recording when and where events occurred within the program. This article is only for use learning. If you want to have a deeper understanding of log management and analysis, you can see = > This complete guide to log ...

Function basis 1. Define function 1. What is a function concept A function is the encapsulation of the code that implements a specific function - > a function corresponds to a function (the function stored in the function) Classification (by who created the function) System functions - there are functions that have been created in Py ...

3. Type conversion 1) Because Java is a strongly typed language, type conversion is required for some operations Low ------------------------------------------------- > High ​ Byte,short,char ----> int ----> long ----> float ---->double 2) In the operation, different types of data are converted to the same type first, and the ...