User Guide

while 75
Parameters
condition The expression that is evaluated each time the while statement executes.
statement(s) The instructions to execute when the condition evaluates to true.
Description
Statement; tests an expression and runs a statement or series of statements repeatedly in a loop
as long as the expression is
true.
Before the statement block is run, the condition is tested; if the test returns
true, the
statement block is run. If the condition is
false, the statement block is skipped and the first
statement after the
while statement’s statement block is executed.
Looping is commonly used to perform an action when a counter variable is less than a
specified value. At the end of each loop, the counter is incremented until the specified value is
reached. At that point, the condition is no longer
true, and the loop ends.
The
while statement performs the following series of steps. Each repetition of steps 1 through
4 is called an iteration of the loop. The condition is tested at the beginning of each iteration:
1. The expression condition is evaluated.
2. If condition evaluates to true or a value that converts to the Boolean value true, such as
a nonzero number, go to step 3.
Otherwise, the
while statement completes and execution resumes at the next statement
after the
while loop.
3. Run the statement block statement(s).
4. Go to step 1.
Example
The following example executes a loop as long as the value of the index variable i is less
than 10:
i = 0;
while(i < 10) {
trace ("i = " add ++i);// Output: 1,2,3,4,5,6,7,8,9
}
See also
continue, do..while, for