Basic Micro Studio Syntax Manual

DO - WHILE
Syntax
do
program statements
while condition
• Statements - any group of commands to be run inside the loop.
• Condition - can be a variable or expression
Supported
• BA - Supported.
• BAN - Supported.
• BAP - Supported.
• BAP40 - Supported.
Description
The DO - WHILE loop executes commands nested inside of it will some condition is true. The
condition can be any variable or expression that is tested every loop until it is false.
Commands
Notes
1. In the programming world 0 is consider false. By default DO - WHILE will test this condition. If a
stand alone variable is used for the test the loop will continue until its value equals 0.
2. DO - WHILE will always run at least once since the condition is checked last in the loop.
3. You can nest multiple DO - WHILE commands within each other. However you can not nest DO -
WHILE with a WHILE - WEND together or the compiler will get the WHILE statements confused.
Example
Connect to the following program with the terminal window set to 9600 baud. The program will
start counting up from 0 to 100. Once index reaches a value of 100 the condition is no longer true.
The less than symbol < was used for the condition and 100 is no longer less than 100 making the
condition false. Since DO - WHILE loops while a statement is true the program exits.
;ALL - all_do_while.bas
Index var word
Main
End
Index = 0
Do
index = index + 1
serout s_out, i9600,[0, “Counting: “, dec index]
pause 75
While index < 100 ;repeat until index is no longer less than 100
serout s_out, i9600, [13,13, “Index = “, dec index]
serout s_out, i9600, [13, “My condition is no longer true.”]
serout s_out, i9600, [13, “Index is no longer less than 100”]
99