lab1

.MODEL SMALL
.STACK 100H
.DATA
MSG1 DB "ENTER 1ST NUMBER: $"
MSG2 DB 0DH,0AH, "ENTER 2ND NUMBER: $"
MSG3 DB 0DH,0AH, "ENTER 3ED NUMBER: $"
MSG4 DB 0DH,0AH, "Calculation of $"
MSG5 DB "AND $"
MSG6 DB " IS: $"

MJ_A DB ?
MJ_B DB ?
MJ_C DB ?
MJ_SUM DB ?

.CODE
  MAIN PROC
    MOV AX,@DATA
    MOV DS,AX

    MOV AH,9
    LEA DX,MSG1
    INT 21H

    MOV AH,1
    MOV MJ_A,AL
    INT 21H

    MOV AH,9
    LEA DX,MSG2
    INT 21H

    MOV AH,1
    MOV MJ_B,AL
    INT 21H

    MOV AH,9
    LEA DX,MSG3
    INT 21H

    MOV AH,1
    MOV MJ_C,AL
    INT 21H

    MOV AH,9
    LEA DX,MSG4
    INT 21H

    MOV AH,2
    MOV DL,MJ_A
    INT 21H

    MOV AH,2
    MOV DL,MJ_B
    INT 21H

    MOV AH,9
    LEA DX,MSG5
    INT 21H

    MOV AH,2
    MOV DL,MJ_C
    INT 21H

    MOV AH,9
    LEA DX,MSG6
    INT 21H

    MOV BL,MJ_A
    ADD BL,MJ_B
    ADD BL,MJ_C
    MOV MJ_SUM,BL

    MOV AH,2
    SUB BL,MJ_C
    MOV DL,MJ_SUM
    INT 21H

    MOV AX,4CH
    INT 21H
    MAIN ENDP