TEM DB 'input a decimal number ','$' TEM1 DB 'please choose one:1.16 2.BCD 3.gongyang 4.quit ','$' TEM2 DB 'result is:','$' STRA DB 0AH,0DH NUM DB 4 DUP(?),'H$' NUM1 DB '0123456789ABCDEF' NUM2