The part of the REPEAT…UNTIL structure which signifies its end.
You can use a REPEAT…UNTIL loop to repeat a set of program instructions until some condition is met.
If the condition associated with the UNTIL statement is never met, the loop will execute for ever. (At least, until Escape is pressed or some other error occurs).
The following example will continually ask for a number and print its square. The only way to stop it is by pressing Escape or forcing a 'Too big' error.
10 z=1 20 REPEAT 30 INPUT "Enter a number " num 40 PRINT "The square of ";num;" is ";num*num 50 UNTIL z=0
Since the result of the test z=0 is always false, we can replace z=0 with FALSE. The program now becomes:
20 REPEAT 30 INPUT "Enter a number " num 40 PRINT "The square of ";num;" is ";num*num 50 UNTIL FALSE
This is a much neater way of unconditionally looping than using a GOTO statement. The program executes at least as fast and the section of program within the loop is highlighted by the indentation.
See the keyword REPEAT for more details on REPEAT…UNTIL loops. See the Variables sub-section for more details on Boolean variables and the keyword AND for logical tests and their results.