While Do

Repeats a statement or statement block continuously while a condition remains true. WHILE...DO is an entry-condition loop, meaning that the loop will not be executed at all unless the Boolean expression is true.

Components

Element The first part of the boolean expression that is to be evaluated against the Value. This element may be a variable, attribute, or result of a function call.
Operator The operator used to compare the Element to the Value in order to check for true or false.
Value The value that is compared to the Element to determine if the statement is true or false.
(Operator) Optional and/or operator that allows you to add additional or alternate conditions for the WHILE DO statement.