Syntax
[DO] WHILEcondition
[statements]
LOOP
Description
WHILE [...] LOOP will repeat the statements between WHILE and
LOOP, while the condition is true.
If the condition isn't
true when the WHILE statement begins, none of the statements will be
run.
The DO is optional in ARMbasic.
WHILE loops have the lowest overhead of all looping constructs, so they are
faster than FOR or DO loops
An EXIT is the proper way to leave a WHILE...LOOP, you can
also use a GOTO or RETURN statement.
Example
' a good way to time
operations
x = 1000000
while x
x -=
1 ' decrement x
y = y *
z ' do something to measure here -- like
multiply for instance
loop
-----------------------------------
...
Finished in 181 msec (on PROplus)
so with loop
overhead of 121 msec, that's 60 nsec to multiply 2
numbers
Differences from other BASICs
- Visual BASIC uses the syntax DO WHILE ... LOOP, which is allowed by
ARMbasic
- PBASIC also requires the DO
- Some BASICs use WHILE ... WEND
See also
