An Assembly Language Program that reads a character and prints it only if it is ‘?’ ( Simulation of If structure )

An Assembly Language Program that reads a character and prints it only if it is ‘?’ ( Simulation of If structure ) .

.MODEL SMALL

.STACK 100H

.DATA

PROMPT DB 'Enter the character : $'

.CODE

MAIN PROC

MOV AX, @DATA ; initialize DS

MOV DS, AX

LEA DX, PROMPT ; load and print PROMPT

MOV AH, 9

INT 21H

MOV AH, 1 ; read a character

INT 21H

MOV BL, AL ; save the input character into BL

CMP BL, "?" ; compare the input character and '?'

JNZ @EXIT ; jump to label @EXIT if input character is

; not equal to '?'

MOV AH, 2 ; carriage return

MOV DL, 0DH

INT 21H

MOV DL, 0AH ; line feed

INT 21H

MOV AH, 2 ; print the input character

MOV DL, BL

INT 21H

@EXIT: ; jump label

MOV AH, 4CH ; return control to DOS

INT 21H

MAIN ENDP

END MAIN