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Program to read two digits whose sum is less than 0, computes and display their sum (using variables)

Posted By: Easy Tutor     Category: Assembly Language     Views: 6142

An AL Program to read two digits whose sum is less than 0, computes and display their sum (using variables).

Code for Program to read two digits whose sum is less than 0, computes and display their sum (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              ; add First and Second digit
     ADD 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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Easy Tutor
Easy Tutor author of Program to read two digits whose sum is less than 0, computes and display their sum (using variables) is from United States. Easy Tutor says

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Jamila Bibi from Australia Comment on: Aug 23
SUB AL, 30H ; save Second digit in VALUE_2 in ASCII code
MOV VALUE_2,AL
WHY WE SUBTARCT 30 FROM AL

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