ASP-Active Server Pages

Topic: ASP

Do...While Commands
Looping is a common requirement in any scripting language, we will learn here how to use Do While, Until , Loops to manage execution of the code blocks more than once.

Let us start with do While Loop , here the condition is checked for the starting of the loop and the code is executed only if the condition is TRUE . Here is the syntax

Do While Condition
Script block here
Loop

As long as the condition is satisfied ( or True ) the script block will be executed. Always at the starting the Condition is checked. Here is a simple script using Do While loop .
Example

Dim my_num
my_num=1
Do While my_num <=10
Response.Write my_num & "<br>"
my_num = my_num +1
Loop

The above code will print 1 to 10 and it will fail to print 11 as the condition checking will return False.
We can modify the Do While loop and keep the condition checking at the end of the Loop.

Do
Script block here
Loop While Condition

Now let us change our old example and try this way.

Dim my_num
my_num=11
Do
Response.Write my_num & "<br>"
my_num = my_num +1
Loop While my_num <=10

Here we can see there is a output of 11 as the inside the loop code is executed once even before the condition is checked and found False. So this way at least once the code inside the Loop will be executed.