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Pascal has two forms of the while loop, while and repeat. While repeats one statement (unless enclosed in a begin-end block) as long as the condition is true. The repeat statement repetitively executes a block of one or more statements through an until statement and continues repeating unless the condition is false. The main difference between ...
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.
for VAR in ENUMERABLE [where CONDITION] get EXPR for VAR in ENUMERABLE where CONDITION Note that by putting the condition and expression after the variable name and enumerable object, editors and IDEs can provide autocompletion on the members of the variable.
condition-controlled loop with test at start of loop: Algol 60: for index := expression while test do <statement> ; Pascal: while test do < statement >; C, Java: while (test) < statement >; Ada: while test loop < sequence > end loop; Fortran 90:
This repeats until the condition becomes false. 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. This means that the ...
Incoming border czar Tom Homan says he's willing to throw Denver Mayor Mike Johnston in jail over his protests about mass deportation. Homan's comments come after Mayor Johnston said he was ...
Do While condition instructions Loop or Do Until notcondition instructions Loop or While condition instructions 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