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Do while loops check the condition after the block of code is executed. This control structure can be known as a post-test loop. This means the do-while loop is an exit-condition loop. However a while loop will test the condition before the code within the block is executed.
Wend (Visual Basic .NET uses End While instead) Do instructions Loop While condition or Do instructions Loop Until notcondition: i must be declared beforehand. For i = first To last «Step 1» instructions Next i. For Each item In set instructions Next item: Visual Basic .NET: For i« As type» = first To last« Step 1» instructions Next« i ...
Dim counter As Integer = 5 ' init variable and set value Dim factorial As Integer = 1 ' initialize factorial variable Do While counter > 0 factorial = factorial * counter counter = counter-1 Loop ' program goes here, until counter = 0 'Debug.Print factorial ' Console.WriteLine(factorial) in Visual Basic .NET
If xxx1 is omitted, we get a loop with the test at the top (a traditional while loop). If xxx2 is omitted, we get a loop with the test at the bottom, equivalent to a do while loop in many languages. If while is omitted, we get an infinite loop. The construction here can be thought of as a do loop with the while check in the middle. Hence this ...
However, infinite loops can sometimes be used purposely, often with an exit from the loop built into the loop implementation for every computer language, but many share the same basic structure and/or concept. The While loop and the For loop are the two most common types of conditional loops in most programming languages.
Visual Basic .NET terminates a block of code with End BlockName statements (or Next statements, for a for loop) which are more familiar for programmers with experience using T-SQL. In C#, the braces, {} , are used to delimit blocks, which is more familiar to programmers with experience in other widely deployed languages such as C++ and Java .
Visual Basic: Application, RAD, education, business, general, (Includes VBA), office automation Yes Yes No Yes Yes No Component-oriented No Visual Basic .NET: Application, RAD, education, web, business, general Yes Yes Yes Yes Yes Yes Structured, concurrent No Visual FoxPro: Application Yes Yes No Yes No No Data-centric, logic No Visual Prolog
Foreach loops; While loops; For loops; Do-while; Exception handling; Enumerated types; Algebraic data types; ... Comparison of Visual Basic and Visual Basic .NET;