CLS
1

PRINT "******** Select action: ********"
PRINT " "
PRINT "1 - exit program"
PRINT "2 - make a sound"
PRINT "3 - draw box"

INPUT "", a

IF a = 1 THEN SYSTEM

IF a = 2 THEN SOUND 2000, 2

IF a = 3 THEN
  FOR c = 1 TO 15
    FOR b = 1 TO 50
      PRINT "#";
    NEXT b
    PRINT " "
  NEXT c
END IF

IF a > 3 THEN PRINT "Number too large"
IF a < 1 THEN PRINT "Number too small"
GOTO 1