Commodore 128D - While; Exit

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The DO/LOOP statement is often used to repeat
an entire routine indefinitely in the body of a r~(
program, as in the following: (—\
Another use of DO/LOOP is as a counter, where
the UNTIL statement is used to specify a certain
number of repetitions.
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Li
Notice that if you leave the counter statement
out (the UNTIL X = 25 part in line 70), the num
ber is doubled indefinitely until an OVERFLOW
error occurs.
WHILE
EXIT
The WHILE statement works in a similar way to l[
UNTIL, but the loop is repeated only while the
condition is in effect, such as in this reworking
of this brief program: \ j"
An EXIT statement can be placed within the
body of a DO/LOOP. When the EXIT statement is
encountered, the program jumps to the next { (
statement following the LOOP statement.
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USING C128 MODE—Some BASIC Commands and Keyboard Operations Unique to
C128Mode