Programmer Think

Title Description This topic is code completion. Please complete the source code given in the topic and copy it to the code box on the right. Select the corresponding compilation language (C/Java) and submit it. If the source code language given in the title is not unique, you only need to select one to complete and submit. After copying, dele ...

1.Zookeeper learning notes 1.1 overview Zookeeper is an open source distributed Apache project that provides coordination services for distributed frameworks. Zookeeper's working mechanism: From the perspective of design pattern: it is a distributed service management framework designed based on observer pattern. It is responsible for stori ...

0 @WebServlet annotation usage 0.1 configuration xml document header Note: if the annotation is "0-version", please note that the configuration is "version-3" <?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instanc ...

1, Transaction What is a transaction? According to the book, it is a set of operations of the system. In order to maintain the integrity of data, it must comply with the characteristics of ACID, namely atomicity, consistency, isolation and Durability. Atomic ity is easy to understand. Operations are either fully executed or not fully executed. ...

The main purpose of writing this blog is to record the following knowledge points, and then introduce its concept and usage one by one. 1. Recognize and use vscode 2. Use g + + to compile and run a multi file C + + project 3. Compile a multi file C + + project with cmake 4. Compile, run / debug a multi file C + + project on cscode 5. Use gdb to ...

Basic circuit 1-bit full adder module full_adder( input a, input b, input cin, output sum, output cout ); assign {cout,sum}=a+b+cin; endmoudle abcinsumcout0000000110010100110110010101011100111111 module full_adder( input a, input b, input cin, output sum, output cout ); assign sum=a^b^cin; assign cout=(a&b) |(c ...

1, Method overview Not to mention what the method is, let's look at the code and analyze where the program has shortcomings and how to improve it. Do not use method int x = 10; int y = 20; System.out.println(x+"+"+y+"="+(x+y)); System.out.println(x+"+"+y+"="+(x-y)); int x1 = 100; int y1 = ...

Foundation type Because Qt is a C + + framework, all syntax and data types in C + + are supported in Qt, but Qt also defines some of its own data types (mostly aliases of C + + data types). Let's introduce these basic data types QT basic data types are defined in #include < qtglobal > Type namenotesremarksqint8signed charSigned 8-bit d ...

preparation: patienceA cup of coffeeA board and a serial port debugging line, at least 16G SD card of any brand  A Linux distribution that can operate skillfully (Archlinux or Ubuntu is recommended)Learn about how to use qemu and binfmt to create RISC-V simulation running environment Recommended readingGet a general idea of how to create a blo ...

In the above, we have roughly understood the usage of pydub library. Today's goal is to write a crawler to crawl song information. For web crawlers, there are corresponding packages in Python's standard library, which can be opened directly: https://docs.python.org/zh-cn/ Go to see the official Chinese documents of the corresponding version of ...