Assignment 2 Solution
3Ask the user to input a decimal number from 0-9 and display its binary equivalence in a newline.
The user must input a number if another character is entered display a message that it is “illegal” then ask the user again. After showing the binary number ask the user if she wants to check another number if (Y-y) is input ask the user to enter a digit, if (N-n) terminate the program. When asking the user if she wants to check, if the input is another character show a message guiding the user to input (Y-y for Yes and N-n for No) then ask again. A sample run is shown at the bottom.

org 100h
;SHOW THE MESSAGE
;and prompt the user to enter a digit
DISP:
MOV AH,9
LEA DX,MS1
INT 21H
MOV AH,1 ;entering a digit
INT 21H
;if it is between 0 and 9 continue
; else print an illigal message
CMP AL,'0'
JNGE ILLI
CMP AL,'9'
JNLE ILLI
;converting the entered number to decimal
AND AX,0FH
MOV BX,AX
;displaying a newline
MOV AH,9
LEA DX,NEWL
INT 21H
;counter 16 times will print a binary number
MOV CX,16

MOV AH,2
TOP_:
ROL BX,1 ;content in BX
JC display_one ; print bit ‘1’
MOV DL,"0" ; else Print bit ‘0’
JMP display display_one:
MOV DL,"1"
Display:
MOV AH,1
INT 21H
CMP AL,'Y'
JE NEWL_
CMP AL,'y'
JE NEWL_
CMP AL,'N'
JE EXIT
CMP AL,'n'
JE EXIT
INT 21H ; Print bit either ‘0’ or ‘1’
LOOP TOP_
;cheking if the user wants to repeat the process again
;if y or n is printed it will be accepted
;else a notification message will be displayed
;that asks the user to enter either y or n
CHK:
MOV AH,9
LEA DX,MS3
INT 21H

Type_YN:
MOV AH,9
LEA DX,MS4
INT 21H
JMP CHK
;displaying illigal message if the user input a different digit
ILLI:
MOV AH,9
LEA DX,MS2
INT 21H
NEWL_:
MOV AH,9
LEA DX,NEWL
INT 21H
JMP DISp
; LOOP BACK
EXIT: ret newl db 0ah,0dh,"$"
MS1 DB "Enter a digit (0-9): $"
MS2 DB " ILLIGAL $"
MS3 DB 0DH,0AH,"DO YOU WANT TO CHECK ANOTHER NUMBER: $"
MS4 DB 0DH,0AH,"Please Type in (Y-y for YES/ N-n for NO) $"