Conditional Iteration (while, do, end)

While loops execute a statement block repeatedly as long as the specified condition evaluates to true. The condition is evaluated before each iteration, meaning the loop body may not execute at all if the condition is initially false.

WhileStmt        = "while" Expression "do" { Statement } "end" ;

The loop continues until the condition evaluates to false or until a break statement is encountered within the loop body. Care must be taken to ensure the condition will eventually become false to avoid infinite loops.

Valid Syntax:

while counter < 10 do
    counter = counter + 1
    Process(counter)
end

while HasMoreData() do
    data = FetchNext()
    ProcessData(data)
end

Notes

• while loops must be terminated with end
• The do keyword is required after the condition
• Infinite loops are possible if the condition never becomes false