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Thread: adding two numbers

  1. Oct 30th, 2002, 03:57 AM #1
    proff.hacker
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    adding two numbers

    how to add two numbers of 2 digits each

    im using this code but it doesnt work when there is a carry on the MSB

    VB Code:
    1. .MODEL SMALL

    2. .STACK 200

    3. .DATA

    4. CRLF    DB  0DH,0AH,'$'

    5. PROMPT1 DB  'Enter the first positive integer:  ','$'

    6. PROMPT2 DB  'Enter the second positive integer:  ','$'

    7. PROMPT3 DB  'The sum of the two numbers is:  : ','$'

    8. .CODE

    9. .STARTUP

    10.     LEA DX,PROMPT1

    11.     MOV AH,09H

    12.     INT 21H

    13.  
    14.     MOV AH,01H

    15.     INT 21H

    16.     SUB AL,30H ; convert character to number

    17.     MOV CH,AL

    18.     

    19.     MOV AH,01H

    20.     INT 21H

    21.     SUB AL,30H ; convert character to number

    22.     MOV CL,AL

    23.     

    24.     LEA DX,CRLF

    25.     MOV AH,09H

    26.     INT 21H

    27.  
    28.     LEA DX,PROMPT2

    29.     MOV AH,09H  

    30.     INT 21H

    31.     

    32.     MOV AH,01H

    33.     INT 21H

    34.     SUB AL,30H ; convert character to number

    35.     MOV BH,AL

    36.     

    37.     MOV AH,01H

    38.     INT 21H

    39.     SUB AL,30H ; convert character to number

    40.     MOV BL,AL   

    41.  
    42.     ADD CL,BL

    43.     ADC CH,BH

    44.  
    45.     ADD CL,30H ; convert number to character

    46.     ;ADD CH,30H

    47.     

    48.     LEA DX,CRLF

    49.     MOV AH,09H

    50.     INT 21H

    51.  
    52.     LEA DX,PROMPT3

    53.     MOV AH,09H  

    54.     INT 21H

    55.  
    56.     MOV DL,CH

    57.     MOV AH,02H

    58.     INT 21H

    59.  
    60.     MOV DL,CL

    61.     MOV AH,02H

    62.     INT 21H

    63.     

    64. .EXIT

    65. END

    can someone help
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  2. Nov 2nd, 2002, 03:33 AM #2
    newDay
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    hello

    up
    ThiS Is Me
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  3. Jul 11th, 2003, 05:04 PM #3
    Darkwraith
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    What is the exact nature of the problem?
    "Can't" and "shouldn't" are two totally separate things.

    All questions should be answered. All answers should be true. That is why I post.
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