conditional if statement

4.2 Item Selection Statements"Teacher, did I pass the level four exam?" ”If the teacher is asked this question, how will he answer? Yes, he will choose different answers according to different conditions:If the test result is greater than or equal

4.2 Item Selection Statements"Teacher, did I pass the level four exam?" ”If the teacher is asked this question, how will he answer? Yes, he will choose different answers according to different conditions:If the test result is greater than or equal

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

If statement The IF statement can be used to form a branch structure that is judged according to the conditions given to determine which branch segment to execute. There are three basic forms of if statements in C language The first form of:

Program flow control Statements in Java include conditional structure, loop structure, and jump statements4.1-Piece structureThe conditional structure includes the sequential structure and the selection structure. The sequential structure does not

Overview#if/#endif statements are commonly used to generate different compilation results based on the same source code, the most common of which is the debug and release versions. However, these tools are not very friendly in practical applications

When we develop PHP pages, we sometimes need to read the information from the database or page according to different criteria before executing the corresponding statement. When it comes to this, we need to understand the use of some conditional

01. Judging by File type =　　　　Common-D,-E,-FTwo types of formats:TEST-E/root/install.log = Common[-e/root/install.log] = both spaces must haveExample: [-d/root] && echo "Yes" | | echo "No": Determine if the file exists and whether it is a directory

First, conditional judgment statementMeet the criteria to execute the corresponding command[Condition]: more commonly used in scriptsCases:[-f/etc/hosts]Test condition: More commonly used for Linux character terminals1. File or directory judgment-F:

If statement formatIf conditionThenCommandElseCommandFi, don't forget this ending.If statement forget the end fiTest.sh:line 14:syntax error:unexpected End of fi if three conditional expressionsIfCommandThen ifFunctionThenCommand execution succeeds,