Present

10 REM --HAPPY BIRTHDAY BASIC!--

20 PRINT "How old is BASIC?"

30 LET N = GETCHAR()

40 IF N <> "" THEN GOTO 70

50 PAUSE 100

60 GOTO 30

70 LET M = GETCHAR()

80 IF M <> "" THEN GOTO 110

90 PAUSE 100

100 GOTO 70

110 LET Z = N + M

120 IF Z = "50" THEN GOTO 150

130 PRINT "Wrong!"

140 GOTO 20

150 PRINT "Correct! Happy Birthday BASIC!"