what if condition

Bash Shell and bashshellI,Terminal Printing [Root @ cai ~] # Echo welcome to bash! Welcome to bash!   [Cairui @ cai ~] $ Echo 'Welcome to bash! ' Welcome to bash!   [Cairui @ cai ~] $ Echo "welcome to bash \! " Welcome to bash \! (Note: special

This was learned more than a year ago. I did not expect to learn it again today. By the way, I will share it with you.   1. shell conditional test command Purpose: test whether the expression is true. If yes, the returned value is 0. If no, the

Basic operators of Swift, Swift Operators Today, I learned the most basic knowledge about Swift language. Here are some of my understandings and conclusions. I hope to help more people understand the area. If anything is wrong, I hope you can point

Every time I write a summary, I think it is a headache, because I know that the summary is really important, and it almost directly determines the number of readers. It may take a lot of effort to write things, because the failure of the abstract

Document directory Indent Space Line feed Braces Null, false, and 0 Name Other punctuation # Include statement Indent Use spaces instead of tabs. Tab only appears in a semantic file, such as makefile. The indent size is 4 spaces.Correct:

One.Three ways to use JS1HTML tag Embedded JS11111Use JS directly on the 2.HTML page3 referencing external JS filesPrecautions1 page JS code and Reference JS code can be embedded in the page anywhere, but does not affect the JS code execution

first, basic if structure1. Flowchart1) Input/output2) Judging and branching3) Process Line　　1.1 Simple if condition to judgeif ( expression ) { the // expression is true to execute the code in {}}Example 1 : If Zhang San's java score is greater

First, basic if structure1. FlowchartInput/OutputJudging and branchingProcess Line1.1 Simple if condition to judgeif ( expression ) {                   // expression is true , execute the code in {}}1.2 Simple if condition to judgeif ( expression ) {

The first day of the Java Learning DiaryJava Learning Preparation WorkFirst Environment configuration:One is the JDK installation,Another compilation tool, Eclipse,Installation Download Tutorials Online Many have looked for one to do just that;When

What is a computer?CPU: The brain of the computer; Read/write Speed 3GHZMemory: (for increased utilization) buffer the hard disk and CPUHard disk: Mechanical hard disk read and write speed 70mb/sThe content that reads and writes in the computer is 01

Some of the selection statements in JavaScript: 1, if statement the code that executes the condition when the specified condition is true. 2, If...else ... Statement executes the code when the statement specifies that the condition is true, and

PHP is called the Magic Method (Magic methods), which starts with two underscores, and these methods play an important role in PHP. Magic methods include: __construct (), constructor for class __destruct (), Destructor of class __call ()

Variable Or you can learn the relative syntax of variables through an instance: The code is as follows Copy Code [HTML][Head][Script language= "JavaScript"]Load up some variables, defining variablesvar hen_num = 3;var

6 Chapter Sixth statements 6.1 One statement per line Each line contains up to one statement. Such as a++; Recommended b--; Recommended a++;　b--; Not recommended 6.2 Compound Statements Compound statements are those that contain "parent

1.JDK (Java SDK)------> JRE (Java Runtime Environment)------> JVM (Java Virtual machine)------> Applications (JAVAC)-------> Javaapi (Util)2.java Running Process:. Java source File--------javac (compilation)------->.class---------> (Java command JVM)

Statement:Order : Executes from top to bottom, ending with a semicolon.branching : Let the program execute different code depending on the condition.If statement: Determines whether the given condition is satisfied, according to the result of the

Speaking of the branching structure in JavaScript, we have to mention the word Process control, all of our programs are made up of data and algorithms. program = data + algorithm Usually, the algorithm can be composed of "order", "branch", "loop"

Preface Come to a new company, write code before, I usually find the leader to develop norms. However, many companies do not have any development specifications, or the development of specifications is really very simple, only to modify the

JavaScript If ... Else Getting Started instance tutorial Conditional declarations in JavaScript are used to perform different actions according to different conditions. Conditional statementOften when you write code, you want to perform different

1, the basic derivation type (1) List derivation is one of the most popular features of Python, and it can be used to construct new lists very efficiently: just a simple piece of code that filters the family elements and distorts the resulting