10 Questions
In Visual Basic, que tipo de valor de retourne le instruction Select Case?
Un seul valeur
Quel est l'avantage principal de l'instruction Select Case en Visual Basic?
Amélioration de la lisibilité du code
Quelle est la syntaxe correcte pour déclarer une instruction Select Case en Visual Basic?
Select Case variable
Quel est le rôle de la clause Case Else dans une instruction Select Case en Visual Basic?
Définir la valeur par défaut
Quelle est la différence principale entre l'instruction Select Case et une série d'instructions If...Then en Visual Basic?
La façon de gérer les valeurs
What is the purpose of the Case Else clause in a Select Case statement?
To specify a default value if no Case clause is true
What happens if you do not include an Case Else clause in a Select Case statement?
The program will not execute any of the Case clauses
How do you specify multiple values to test against in a single Case clause?
Separate the values with commas
What is the scope of the variable being tested in a Select Case statement?
It can be a local, module-level, or global variable
Can you use a range of values in a Case clause?
Yes, using the To keyword
Study Notes
Declaration of Select Case Statement
- In Visual Basic programming, the Select Case statement is used for selective execution of code based on the value of an expression.
- The statement evaluates an expression and executes one of the many blocks of code based on the value of the expression.
Syntax
- The general syntax of the Select Case statement is:
Select Case expression [Case expressionlist] [code] [Case Else [code]] End Select. - The
expressionis the value that is evaluated, and theexpressionlistis a list of values that are compared with theexpression.
Execution
- The code in the
Select Caseblock is executed when the value of theexpressionmatches one of the values in theexpressionlist. - If the value of the
expressiondoes not match any of the values in theexpressionlist, the code in theCase Elseblock is executed. - The
Case Elseblock is optional, and if it is not present, the program will not execute any code if the value of theexpressiondoes not match any of the values in theexpressionlist.
Example
- For example,
Select Case x Case 1 to 5 [code] Case 6 to 10 [code] Case Else [code] End Selectwill execute the first block of code ifxis between 1 and 5, the second block of code ifxis between 6 and 10, and the third block of code ifxis not in the range of 1 to 10.
Test your knowledge of the Select Case statement in Visual Basic programming. Learn how to use this powerful control structure to simplify your code and improve readability.
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