Page 376 - Webapplication11_C11_Flipbook
P. 376
Example:
<HTML>
<BODY text="blue">
<H2> Using while loop in JavaScript</H2>
<SCRIPT>
var i = 1;
while (i <=5) {
document.write("<br><br> The square of "+i+" is "+(i*i));
i++;
}
</SCRIPT>
</BODY>
</HTML>
On running the above program, we get the following output:
Do You Know?
Any non-zero value in the while loop indicates always a true condition,
whereas zero indicates always-false condition.
The do….while Loop
Do while is a different type of loop than either the for or while loops. This loop will always execute the statement at
least once, even if the condition is false. After one iteration of the loop has been completed, the condition is checked.
Depending on the condition, the loop will continue to run further or terminate.
Syntax of the do…while loops is as follows:
initialisation_expression;
do
{
//Loop body
update_expression;
} while (conditional_expression);
Where,
Ð Ðinitialisation_expression: In this expression, a variable is initialized outside the loop.
Ð Ðupdate_expression: The loop control variable is updated here.
374 Touchpad Web Applications-XI

