if statement

The IF statement is used to test the condition and execute a table or several statements when the condition is true.Note: If expression cannot be followed by a semicolon, it itself represents an empty statement in the code, causing the compiler to

1, test: the detection of the expression is established, the return value is 0, otherwise, not 0Method:1) test expression2) "Expression"2. File test:-D: Whether it is a directory-F: Whether it is a file-E: whether there is-r: Whether Read permission

Tag: Shell script if statement Yang Shufan Shell $?In a simple shell script, each statement is executed sequentially in order to automate the batch process. However, a single sequential structure makes scripting less intelligent and difficult to

UglifyJS is a tool for compressing and beautifying javascript. In its documentation, I see several methods for optimizing if statements. Although I haven't used it for some trial tests, I can see from here that it has done some beautification work

Review the if statement in Python and learn pythonif Basic statement Structure Copy codeThe Code is as follows:If condition 1:Execute Statement 1 ......Elif judgment condition 2:Execute Statement 2 ......Elif judgment Condition 3:Execute Statement 3

Python's if Statement general formatif : elif: else: The condition of the IF statement can be expressed by > (greater than), = (greater than or equal), Some examplesExample 1:# -*- coding: UTF-8 -*-flag = Falsename =

Smarty Template, JS modified the value of the form, if directly in the template with the form value of the IF statement to judge? Code: form values with ID Taocanid are now dynamically added for jquery. Now you want to use this value to

ArrayVariable: memory storage space;Variable characteristics: Only one data can be stored in each variable, the variable can only be assigned onceAn array of contiguous memory spaces that hold one or more elements, or a collection of multiple

1. Java If statement1,if statement if (condition) {statement;}if (condition) {statement 1;}else{statement 2;}2, multiple If-else statement if (condition 1) {statement 1;}else if (condition 2) {statement 2;}else{statement;}2, go if statement For

In Java programming, the branching structure is done by a conditional statement (if statement). The IF statement can be used either alone or with else. Here's how to use it: If statements are used aloneif (conditional expression) {Purpose

If conditions are determined to meet different conditions and perform different operations, we only need to learn programming and know the role of if. Let's take a look at how to use if in the mysql stored procedure. Today, let's talk aboutMysql

This article mainly introduces how to use if Shell script to program if statements. for details, refer to the if statement format. If condition Then Command Else Command Fi, don't forget the end. If statements forget the final fi Test. sh: line 14:

An if (conditional expression) statement The IF statement is a conditional judgment statement, and for an expression in parentheses in the IF statement, ECMAScript automatically calls the Boolean () transformation function to convert the result

1. Exercise: Write a scriptdetermine if there is a user's default shell for bash on the current system; If so, the number of such users is displayed, and one of the user names is displayed;Otherwise, no such user is shown;#!/bin/bash# program#

In Pycharm, when editing a program, often the code is correct, but do not know where the error, here in the following example to illustrate the importance of code format in the Pycharm. Title: Write a function, accept a positive even number as a

Last time we used for a for loop processing. This time we learn if statements. A simple example is as follows: #light let　add　x　y　=　x　+　y if　add　2　3　=　5　then　printfn　"2　+　3　=　5" if　add　2　3　=　6　then　printfn　"2　+　3　=　6"　else　printfn　"2　+　3　!=　6"

4.1 IF StatementIF statement two forms; If-then if-then-else using If-then, you can specify a set of actions that need to be performed. If-then-else statement specifies two sets of actions1. If-then true to execute a statement sequenceStructure:IF

computers can do a lot of automated tasks, because it can make their own conditions to judge. Output Results Note: the indentation rules for Python code . Code with the same indentation is treated as a block of code, with 3, 4 lines of

-eq equals-ne Not equal to-GT Greater than-lt less than-le less than or equal to-ge greater than or equal to-Z Empty string= Two characters equal! = Two characters are not equal-N Non-empty stringStrings are commonly used to check user input,

  Design a prompt menu for user selection, and perform operations and display based on user selection. Menu: 1. Start vi Editor 2. Start x-windows and enter the graphic interface 3. Start the background printing process. 4. Exit ctrl + c. #!