control statements

Conditional control Statements:if Condition control statement:Format:An If expression:　　Statement 1 (the statement must be preceded by a tab, otherwise no statement is considered)Logic: Expression is set, then statement 1 is executed, otherwise

If statementIn an if statement, the block of code is judged by the number of spaces that are indented, which means that contiguous rows with a consistent number of spaces are treated as a block of code, which is executed when the condition of the if

1.if statements(1) If statement of two-way branch(2) If statement of the multi-path conditional Judgment Branch2. Test statements(1) file test(2) String test(3) Numerical test(4) Test statements combined with logical operators3.case statements4.for

1. Branch statements(1) Conditional statement ifIfElseIf Else(2) Multi-branch statement switchA switch statement can use integers, floating-point numbers, characters, strings, and tuples, and its values can be discrete or continuous.The case branch

Select statements, also called conditional branching statements: If......else and Switch......case, where the else in If......else is optional, but the case in switch......case is required.The condition after switch must be a byte, short, int, or

The sixth chapter is familiar with the Java Process Control statementJava Program flow control is divided into sequential structure , selection structure , loop structure and jump statements . Sequential structure: execute from top to

1. Operators1.1, arithmetic operator + ( addition has three usages: addition, plus, String connector )-*/% + +--1.1.1,/is the pickup,% is the surplusUsage of 1.1.2, + + and--(A: function is self-increment, self-subtraction)B: used alone: in front

Process Control for Java:1. Sequential structure2. Select structureA, relational operations, logical operations, conditional operationsB, if statementC, if-else statement, If-else If-else statementd, switch statements,3. Circular statementsA, while

1.if StatementsSyntax: if (condition) {Execution when conditions are in existence　　}else{Conditions do not set up the implementation}Casesvar ji =; if (ji>=20) { Console.log (' congratulate you, eat chicken success, good fortune '

I. GrammarEverything in 1.javascirpt (variables, function names, and operators) is strictly case-sensitive.2.javascript (identifier)An identifier is a variable, a function, the name of a property, or an argument to a function.Naming rules: The first

1, make a judgment (if statement)An IF statement is a statement that is used when the appropriate code is executed based on a condition.Grammar: if (condition) {The code executes when the condition is set } Example: Suppose you

Control | loops | The statement is well known, flash animation depends on the timeline, in the absence of script, the animation will be in accordance with the timeline from the first frame non-stop play to the last frame, and then play again or

SetServerout on;---This can only be used in SQL Plus, meaning that the server output information is displayed in the window. DeclareN Number:=1;---Define a variable (of course you can define multiple variables consecutively)Vvarchar2( -):='Baize'; N2

User information in MySQL is stored in the users table of the system database MySQLTo create a user:Create user ' username ' @ ' allows its login address ' identified by ' password ';Note: Users created will need to specify at which address the user

SELECT statement1. If...then statementsGrammar:If Thenplsql_sentenceend if;Condition_expression: Represents a conditional expression whose value is true when the program executes the PL/SQL statement below if;If the value is False, the program

1. SELECT statement1.1 IF ... Then ... END If statementDECLARE my_age int;if my_age is null and dbms_output.put_line (' Age is null '); END IF;　　1.2 IF ... Then Elsif then .... ELSE then ... endif statement, it should be noted here is elsif

DECLARECNT Pls_integer; BEGIN SELECT COUNT(*) Fcount intoCNT from(SELECT 1 fromUser_tab_columnsWHERE(table_name= '{

Process Control StatementsIn the shell if multiple commands are entered in the terminal, the commands are placed in the background if they are separated by &, and a collection of commands is represented if delimited. Shell allows logical operators

Case statementcase $变量名 in "值1"） ? 如果变量的值等于值1,则执行程序1 ;; ?"值2"） ? 如果变量的值等于值2,则执行程序2 ;; ? ...省略其他分支... ? *) ? 如果变量的值都不是以上的值,则执行此程序 ;;esac ?//case反过来写"case语句的使用实例"#!/bin/bashread "please input yes /no": chocase "$cho" in "yes") ? ? echo "输入正确！";; ?"no"

Declare mycursor Cursor FORSelect * FROM table1Open MyCursorFetch next from MyCursor to @ variableWhile @ @FETCH_STATUS =0Begin--processing a single recordFetch Next from MyCursorEndClose MyCursorDeallocate mycursor     Third, Process Control