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# Program to read two digits such that second digit is less than the first digit, computes and display their difference ( using Variables )

Posted By: Easy Tutor     Category: Assembly Language     Views: 7136

## Code for Program to read two digits such that second digit is less than the first digit, computes and display their difference ( using Variables ) in Assembly Language

``` .MODEL SMALL
.STACK 100H

.DATA
PROMPT_1  DB  'Enter the First digit : \$'
PROMPT_2  DB  'Enter the Second digit : \$'
PROMPT_3  DB  'Sum of First and Second digit : \$'

VALUE_1   DB  ?
VALUE_2   DB  ?

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

LEA DX, PROMPT_1             ; load and display the PROMPT_1
MOV AH, 9
INT 21H

MOV AH, 1                    ; read a character
INT 21H

SUB AL, 30H                  ; save First digit in VALUE_1 in ASCII code
MOV VALUE_1,AL

MOV AH, 2                    ; carriage return
MOV DL, 0DH
INT 21H

MOV DL, 0AH                  ; line feed
INT 21H

LEA DX, PROMPT_2             ; load and display the PROMPT_2
MOV AH, 9
INT 21H

MOV AH, 1                    ; read a character
INT 21H

SUB AL, 30H                  ; save Second digit in VALUE_2 in ASCII code
MOV VALUE_2,AL

MOV AH, 2                    ; carriage return
MOV DL, 0DH
INT 21H

MOV DL, 0AH                  ; line feed
INT 21H

LEA DX, PROMPT_3             ; load and display the PROMPT_3
MOV AH, 9
INT 21H

MOV AL, VALUE_1              ; Subtract First and Second digit
SUB AL, VALUE_2

ADD AL, 30H                  ; convert ASCII to DECIMAL code

MOV AH, 2                    ; display the character
MOV DL, AL
INT 21H

MOV AH, 4CH                  ; return control to DOS
INT 21H
MAIN ENDP
END MAIN

;**************************************************************************;
;**************************************************************************;
;------------------------------  THE END  ---------------------------------;
;**************************************************************************;
;**************************************************************************;
```
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