; By: Ali Hassan Soomro .MODEL SMALL .STACK 100H .DATA MAIN_MENU DB ,0DH,0AH,"Calculater",0DH,0AH DB "Press 'A' For ADDITION",0DH,0AH DB "Press 'S' For SUBTRACTION",0DH,0AH DB "Press 'M' For MULTIPLICATION",0DH,0AH DB "Press 'D' For DIVISION",0DH,0AH DB "Press 'E' For EXIT",0DH,0AH DB "Press 'R' For RETURN to Main Menu",0DH,0AH DB "*******************************",0DH,0AH DB "*******************************",0DH,0AH DB "Enter Your CHOICE",0DH,0AH,'$' NUM1 DB "Enter First Number",0DH,0AH,'$' NUM2 DB ,0DH,0AH,"Enter Second Number",0DH,0AH,'$' ADD1 DB ,0DH,0AH,"FOR ADDITION",0DH,0AH,'$' SUB1 DB ,0DH,0AH,"FOR SUBTRACTION",0DH,0AH,'$' MUL1 DB ,0DH,0AH,"FOR MULTIPLICATION",0DH,0AH,'$' DIV1 DB ,0DH,0AH,"FOR DIVISION",0DH,0AH,'$' EX DB ,0DH,0AH,"GOOD BYE AND HAVE A NICE TIME :)",0DH,0AH,'$' ANS DB ,0DH,0AH,"ANSWER ",0DH,0AH,'$' CONTINUE DB ,0DH,0AH,"DO YOU WANT TO CONTINUE",0DH,0AH,'$' OP1 DB ? OP2 DB ? Operand DB ? CON DB ? .CODE .STARTUP START: MOV AH,09H MOV DX, OFFSET MAIN_MENU INT 21H MOV AH,01H INT 21H CMP AL,'A' JE _ADD CMP AL,'S' JE _SUB CMP AL,'M' JE _MUL CMP AL,'D' JE _DIV CMP AL,'R' JE START CMP AL,'E' JE EXIT _ADD: ; PERFORMING ADDITION MOV AH,09H MOV DX,OFFSET ADD1 INT 21H ;FIRST OPERAND MOV AH,09H MOV DX,OFFSET NUM1 INT 21H MOV AH,01H INT 21H MOV OP1,AL ;SECOND OPERAND MOV AH,09H MOV DX,OFFSET NUM2 INT 21H MOV AH,01H INT 21H MOV OP2,AL MOV AH,09H MOV DX, OFFSET ANS INT 21H MOV AL,OP1 MOV BL,OP2 ADD AL,BL AAS OR AX, 3030H ; PRINT RESULT MOV AH,0EH INT 10H ;FOR CONTINUE MOV AH,09H MOV DX,OFFSET CONTINUE INT 21H MOV AH,01H INT 21H CMP AL,'Y' JE START CMP AL,'E' JE EXIT _SUB: ; PERFORMING SUBTRACTION MOV AH,09H MOV DX,OFFSET SUB1 INT 21H ;FIRST OPERAND MOV AH,09H MOV DX,OFFSET NUM1 INT 21H MOV AH,01H INT 21H MOV OP1,AL ;SECOND OPERAND MOV AH,09H MOV DX,OFFSET NUM2 INT 21H MOV AH,01H INT 21H MOV OP2,AL MOV AH,09H MOV DX, OFFSET ANS INT 21H MOV AL,OP1 MOV BL,OP2 SUB AL,BL AAS OR AX, 3030H ; PRINT RESULT MOV AH,0EH INT 10H ;FOR CONTINUE MOV AH,09H MOV DX,OFFSET CONTINUE INT 21H MOV AH,01H INT 21H MOV CON,AL MOV AL,CON CMP AL,'Y' JE START CMP AL,'E' JE EXIT _MUL: ; PERFORMING MULTIPLICATION MOV AH,09H MOV DX,OFFSET MUL1 INT 21H ;FIRST OPERAND MOV AH,09H MOV DX,OFFSET NUM1 INT 21H MOV AH,01H INT 21H SUB AL,30H MOV OP1,AL ;SECOND OPERAND MOV AH,09H MOV DX,OFFSET NUM2 INT 21H MOV AH,01H INT 21H SUB AL,30H MOV OP2,AL MOV AH,09H MOV DX, OFFSET ANS INT 21H MOV AL,OP1 MOV BL,OP2 MUL BL ADD AL,30H ; PRINT RESULT MOV AH,0EH INT 10H ;FOR CONTINUE MOV AH,09H MOV DX,OFFSET CONTINUE INT 21H MOV AH,01H INT 21H MOV CON,AL MOV AL,CON CMP AL,'Y' JE START CMP AL,'N' JE EXIT _DIV: ; PERFORMING DIVISION MOV AH,09H MOV DX,OFFSET DIV1 INT 21H ;FIRST OPERAND MOV AH,09H MOV DX,OFFSET NUM1 INT 21H MOV AH,01H INT 21H SUB AL,30H MOV OP1,AL ;SECOND OPERAND MOV AH,09H MOV DX,OFFSET NUM2 INT 21H MOV AH,01H INT 21H SUB AL,30H MOV OP2,AL MOV AH,09H MOV DX, OFFSET ANS INT 21H MOV AX,0000H MOV AL,OP1 MOV BL,OP2 DIV BL ADD AL,30H ; PRINT RESULT MOV AH,0EH INT 10H ;FOR CONTINUE MOV AH,09H MOV DX,OFFSET CONTINUE INT 21H MOV AH,01H INT 21H MOV CON,AL MOV AL,CON CMP AL,'Y' JE START CMP AL,'E' JE EXIT EXIT: ; SAY GOOD BYE AND THEN EXIT MOV AH,09H MOV DX,OFFSET EX INT 21H .EXIT END