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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.
function LookupCode (sCode as string) as integer dim iReturnValue as integer dim sLine, sPath as string sPath = "C:\Test.dsv" if FileExists (sPath) then open sPath for input as # 1 do while not EOF (1) line input # 1, sLine if sCode = left (sLine, 3) then 'Action(s) to be carried out End if loop close # 1 End if LookupCode = iReturnValue end function
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.
In most computer programming languages, a while loop is a control flow statement that allows code to be executed repeatedly based on a given Boolean condition. The while loop can be thought of as a repeating if statement .
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Download QR code; In other projects Appearance. move to sidebar hide ... UML diagram of a do while loop: File usage. The following page uses this file: Do while loop;