conditional statements in bible

1. A statement block is a set of statements that executes or executes multiple times (a loop statement) when the condition is true (a conditional statement). Put a space in front of the code to indent the statement to wear a statement block. Each row in the block should be indented in the same amount. In Phyton, a colon (:) is used to identify the beginning of a statement block, and each statement in the bl

Summary:? Since the special JavaScript language causes it to have a lot of specific conditions to judge, I have listed some special conditional judgment statements and their corresponding results.1 if (condition) {2 console.log (true); 3 Else {4 console.log (false); 5 } Condition Result Undefined False ' Undefined ' True []

I understand it as follows: Data type:A conditional statement is both a string:If condition judgment: name= "Product Data"code block n1= ' data type 'Elif:n2= "" "Database" "" (Four Methods of representation)code block n3= ' ' parameter 'Print (' ... ') addition:Conditional statements Simple multi-layered nesting:　　　　　　　　　　If condition judgment: data:If condition judge: A1=39/8 #得到全值 a1=39%8 #得到余数 a1=39//8

This article mainly introduces the conditional judgment statement in Python, is the basic knowledge in Python introduction, need friends can refer to the An else statement can be combined using an if statement. If the conditional expression in the If statement resolves to a value of 0 or FALSE, the Else statement contains code execution. The Else statement is an optional declaration, and there is at most

;} As more system functions are constantly being developed, we consider adding more and more commands to the vehicle as follows: enum Drivecommand { Start, Stop, Pause, turnleft, turnright }With the addition of the Drivecommand element, it is obvious that the use of an if or switch statement will bring about a horrible state of chaos. In a complex control system, commands can be as many as hundreds. For each additional life, we first need to modify t

Comparison of conditional judgment statementsProcess Control to make conditional statement judgment, often use a variety of data types of variables and 0 value comparison problem, here is a summary to deepen the understanding of the data type, non-canonical and 0 comparison statements are easy to participate in the comparison of the data types are misunderstood.§

: executing statement 3 ... Else : EXECUTE statement 4 ...Since Python does not support switch statements, multiple judgment conditions can be implemented with elif, and if it is judged that multiple conditions need to be judged simultaneously, you can use or and and, in the operation judgment of the OR and and, follow and take precedence over or in operations already x and Y X=true equals y, x or y x=true equals x rule. num=-1 ; if num0 or

Often, when we write code, we need to perform different actions based on different judgments, and we can use conditional statements to do the work.If ... Then ... ElseIn the following scenario, you can use the If ... Then ... Else statement: Executes a piece of code when the condition is true When you select one of two pieces of code to execute Dim ' define a variable - if $ Then ' if

The switch statement is similar to the IF statement, both conditional statements. In many cases, you need to compare a variable (or expression) to a different value and execute a different code depending on which value it equals, which is more appropriate when using a switch statement. The switch statement is also the longest common logical control statement in object-oriented programming

First, conditional statementsIf statementif (condition 1) {Code 1}else if (condition 2) {Code 2}......else{Code n}Switch statementNot commonly used, only the following types of comparisons are supported: String, Char, Boolean, enum, integerSecond, the circular statementWhile structurewhile (loop condition) {Loop body}Loop control statement:break: End the entire loop immediately　　　　　　　continue: Immediately ends the current number of loops and runs the

Conditional statement: If ... else elifLoop statement: while forExit: Break continue return exit passApplication Scenario: Level Three menu Enter City serial number enter the menu input b return input Q exit#!/usr/bin/env Python3ImportOSImportSYS" "make a level three menu Shandong Rizhao East Haven Lanshan Wulian" "defShowcd (dir):" ":p Aram dir: The directory to go: return: Returns the list under the directory to go" " if(Os.path.exists (dir)): Di

One, Boolean variables 1, false,none,0, "", (), [],{} value is used as a Boolean expression, the interpreter will see the false. All the others are true.2, True==1,false==0.3. The bool function can be used to convert other values.Second, conditional execution and if statement 1. If statement: Determines whether the entered name ends in Gumby, then executes the statement block print.Operation Result:2. Else clause:Operation Result:3. ELIF clause:Operat

= c-a *= Multiplication assignment operator c = A is equivalent to C = C A /= Division assignment operator C/= A is equivalent to C = c/a %= Modulo assignment operator C%= A is equivalent to C = c% A **= Power assignment operator c = A is equivalent to C = C A /= Take the divisible assignment operator C//= A is equivalent to C = c//A 5.

First, conditional control statements1. IfScripttype= "Text/javascript"> varNum= 1 if(Num== 3) {alert ("1"); } Else if(Num== 2) {alert ("2"); } Else if(Num== 1) {alert ("1"); } Else{alert ("0"); }Script>2. SwitchGetting Started with JavaScript (iv) Conditional control statements

1. Conditional statementsIndent with 4 spaces#A.N1 = input ('>>>')if "Alex"=="Alex"N2= Input ('>>>') ifN2 = ="Confirm" Print('Alex SB') Else: Print('Alex DB') Else: Print('Error')#Note: n1= "Alex" Assignment#n1= ' Alex ' comparison#B.ifCondition 1:PasselifCondition 2:PasselifCondition 3:PassElse:PassPrint('End')#c.Condition 1 and orifN1 = ="Alex" orN2 = ="alex!123":Print('OK')Else: Print('OK')#pass generation refers to

In PHP, conditional statements mainly use statements such as if else and if ElseIf and Swicth case, which are used to the most. One, if...else statements If...else statements Executes a piece of code when the condition is established, and executes another piece of code when

Label: style http OS ar Java for SP on 20146.1 ① A Condition Statement is called a control flow in a script. ② Although JavaScript does not support the "elseif" keyword, it is allowed to create such statements through the IF/else statement chain. ③ The break statement is also used for the default item in the switch Condition Statement, because if it is not at the end, the subsequent case will still be executed. ④ If there is no default in case, and it

expression with a variable, such as a * 23, case matching, execute the program code in the matching block, if not met break will continue to execute the contents of the next block of case until the break statement or switch statement block end such as 650) this.width=650; "src = "Http://img.mukewang.com/5364f6440001425d04810245.jpg"/>, running result: 650) this.width=650; "src="/HTTP/ Img.mukewang.com/5364f74800013d9101330090.jpg "/>4. You can combine case

As in other languages, JavaScript also has conditional statements that judge the process. Includes various operations in accordance with logical statementsComparison operators The usual comparison operators are equal to = = , not equal to! = , greater than >, less than , greater than or equal to >= , less than or equal to document.write ("Study" = = "Study")//false document.write ("Study" );//f

Shell script [Operational expressions, conditional control statements], shell expressions #! /Bin/bash # The four expressions you deserve to add to your favorites. Val1 = 1val2 = 1val3 = 1val4 = 1val5 = 1val6 = 1val7 = 1let val1 ++ (val2 ++) val3 = $ ($ val3 + 1 )) val4 = 'expr $ val4 + 1' val5 = 'bc You should understand the condition control statements. #! /B