nhap vao 2 so nguyen duong (1 <= x2 < x1 < 9) ; thuc hien cac phep tinh: x1-1 , x1+2 , x1+x2 , x1-x2

.MODEL small
.STACK 100h
.DATA
sThBao1 DB 13,10,"x1 = $"
sThBao2 DB 13,10,"x2 = $"
sTBKetQua1 DB 13,10,"x1 - 1 = $"
sTBKetQua2 DB 13,10,"x1 + 1 = $"
sTBKetQua3 DB 13,10,"x1 + x2= $"
sTBKetQua4 DB 13,10,"x1 - x2= $"

iSo1 DB ?
iSo2 DB ?
.CODE
; lay dia chi data dua vao DS
MOV AX,@data
MOV DS,AX
; xuat sThBao1 & nhap iSo1 tu ban phim
MOV AH,9
MOV DX,offset sThBao1
INT 21h

MOV AH,1
INT 21h
MOV iSo1,AL
; xuat sThBao2 & nhap iSo2 tu ban phim
MOV AH,9
MOV DX,offset sThBao2
INT 21h

MOV AH,1
INT 21h
MOV iSo2,AL
; chuyen ki tu thanh so
SUB iSo1,48
SUB iSo2,48
; xuat sTBKetQua1 va ket qua phep tinh iSo1 - 1
MOV AH,9
MOV DX,offset sTBKetQua1
INT 21h

MOV BH,iSo1 ; dua iSo1 vao thanh ghi BH
DEC BH ; thuc hien phep tinh iSo1 - 1
ADD BH,48 ; chuyen ket qua tu so sang ki tu

MOV AH,2
MOV DL,BH
INT 21h
; xuat sTBKetQua2 va ket qua phep tinh iSo2 + 1
MOV AH,9
MOV DX,offset sTBKetQua2
INT 21h

MOV BH,iSo2 ; dua iSo2 vao thanh ghi BH
INC BH ; thuc hien phep tinh iSo2 + 1
ADD BH,48 ; chuyen ket qua tu so sang ki tu

MOV AH,2
MOV DL,BH
INT 21h
; xuat sTBKetQua3 va ket qua phep tinh iSo1 + iSo2
MOV AH,9
MOV DX,offset sTBKetQua3
INT 21h

MOV BH,iSo1 ; dua iSo1 vao BH
ADD BH,iSo2 ; thuc hien phep tinh iSo1 + iSo2
ADD BH,48 ; chuyen ket qua tu so sang ki tu

MOV AH,2
MOV DL,BH
INT 21h
; xuat sTBKetQua4 va ket qua phep tinh iSo1 - iSo2
MOV AH,9
MOV DX,offset sTBKetQua4
INT 21h

MOV BH,iSo1 ; dua iSo1 vao BH
SUB BH,iSo2 ; thuc hien phep tinh iSo1 - iSo2
ADD BH,48 ; chuyen ket qua tu so sang ki tu

MOV AH,2
MOV DL,BH
INT 21h
; ket thuc chuong trinh
MOV AH,4Ch
INT 21h
END