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problem1.asm
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problem1.asm
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.MODEL SMALL
.STACK 100H
.DATA
CR EQU 0DH
LF EQU 0AH
NEWLINE DB CR, LF , '$'
PROMPT1 DB 'X = ? $'
PROMPT2 DB 'Y = ? $'
OP1 DB 'Z = X-2Y = $'
OP2 DB 'Z = 25-(X+Y) = $'
OP3 DB 'Z = 2X-3Y = $'
OP4 DB 'Z = Y-X+1 = $'
X DB ?
Y DB ?
Z DB ?
.CODE
MAIN PROC
;DATA SEGMENT INITIALIZATION
MOV AX, @DATA
MOV DS, AX
;print user prompt
LEA DX, PROMPT1
MOV AH, 9
INT 21H
;INPUT X
MOV AH, 1
INT 21H
; TRANSFER input to variable
SUB AL, 30H
MOV X, AL ; output is stored in AX
; OUTPUT NEWLINE
LEA DX, NEWLINE
MOV AH,9
INT 21H
;print user prompt
LEA DX, PROMPT2
MOV AH, 9
INT 21H
;INPUT Y
MOV AH, 1
INT 21H
; TRANSFER input to variable
SUB AL, 30H
MOV Y, AL ; output is stored in AX
; OUTPUT NEWLINE
LEA DX, NEWLINE
MOV AH,9
INT 21H
;OPERATION 1 : Z = X-2Y
MOV AL,X
SUB AL,Y
SUB AL,Y
ADD AL,30H
MOV Z,AL
;print string
LEA DX, OP1
MOV AH, 9
INT 21H
;display Z
MOV AH, 2
MOV DL, Z
INT 21H
; OUTPUT NEWLINE
LEA DX, NEWLINE ;DX : USED IN IO and MUL,DIV
MOV AH,9 ; AH,9 used for character string output
INT 21H
;OPERATION 2 : Z = 25-(X+Y)
MOV AL,25d
SUB AL,X
SUB AL,Y
ADD AL,30H
MOV Z,AL
;print string
LEA DX, OP2
MOV AH, 9
INT 21H
;display Z
MOV AH, 2
MOV DL, Z
INT 21H
; OUTPUT string
LEA DX, NEWLINE ;DX : USED IN IO and MUL,DIV
MOV AH,9 ; AH,9 used for character string output
INT 21H
;OPERATION 3 : Z = 2X-3Y
MOV AL,X
ADD AL,X
SUB AL,Y
SUB AL,Y
SUB AL,Y
ADD AL,30H
MOV Z,AL
;print string
LEA DX, OP3
MOV AH, 9
INT 21H
;display Z
MOV AH, 2
MOV DL, Z
INT 21H
; OUTPUT string
LEA DX, NEWLINE ;DX : USED IN IO and MUL,DIV
MOV AH,9 ; AH,9 used for character string output
INT 21H
;OPERATION 4 : Z = Y-X+1
MOV AL,Y
SUB AL,X
ADD AL,1
ADD AL,30H
MOV Z,AL
;print string
LEA DX, OP4
MOV AH, 9
INT 21H
;display Z
MOV AH, 2
MOV DL, Z
INT 21H
; OUTPUT string
LEA DX, NEWLINE ;DX : USED IN IO and MUL,DIV
MOV AH,9 ; AH,9 used for character string output
INT 21H
;DOS EXIT
MOV AH, 4CH
INT 21H
MAIN ENDP
END MAIN