10 CLS
20 INPUT "choose a number", A$
30 IF A$>10 GOSUB 100
40 if A$<5 GOSUB 100
50 PRINT "you typed ", A$
60 END 
99 REM the following 2 lines are a subroutine!
100 PRINT "you must enter a number between 5 and 10"
110 RETURN