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Index > DOS > addition of two digit number..help!!

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manjaru



Joined: 22 Feb 2010
Posts: 1
manjaru
hello.. i dont know what the problem of my program..
my program is all about addition of two numbers..

here is my program in fasm:
Code:
org 100h

start:

mov ax,03h
int 10h

mov dx, message
mov ah,9
int 21h

xor ah,ah
int 16h
mov bh,al
;push bx

xor ah,ah
int 16h
mov bl,al
push bx

mov ah,9
int 21h

xor ah,ah
int 16h
mov ch,al

xor ah,ah
int 16h
mov cl,al

mov dx, result
mov ah,9
int 21h

add bl,cl
sub bl,30h

cmp bl,0ah
jae label_x

add bh,ch
sub bh,30h

;mov dl,bl
;mov dx, result
;mov ah,9
;int 21h


mov dl,bl
mov ah,2
int 21h

mov dh,bh
mov ah,2
int 21h
int 20h

label_x:
add bl,06h
pop cx
push cx
;shl bl,4

;mov dx,result
;mov ah,9
;int 21h

;add bl,30
;mov dl,bl
;mov ah,3
;int 21h


message: db 13,10,"enter 2 digit numbers: $"
result: db 13,10, "sum: $"    


hope you will solve it immedeatly.. thanks!! godbless Crying or Very sad
Post 22 Feb 2010, 04:15
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17662
Location: In your JS exploiting you and your system
revolution
Is this a homework assignment?
Post 22 Feb 2010, 05:26
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DOS386



Joined: 08 Dec 2006
Posts: 1901
DOS386
manjaru wrote:
hope you will solve it immedeatly


NOT before you reveal what the problem is Neutral

Quote:
.. thanks!! godbless


Some hints:

1. Add comments
a) What register holds what ???
b) What call to INT $21 or $16 does what ???
2. Remove dead code
3. Recheck termination
Post 22 Feb 2010, 08:28
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adroit



Joined: 21 Feb 2010
Posts: 252
adroit
You need to add some comments on the instructions that are used. They help "debuggers" with actually knowing what the problem is with the code, or what the code does.


Quote:
Some hints:

1. Add comments
a) What register holds what ???
b) What call to INT $21 or $16 does what ???
2. Remove dead code
3. Recheck termination

_________________
meshnix
Post 22 Feb 2010, 20:18
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bitshifter



Joined: 04 Dec 2007
Posts: 764
Location: Massachusetts, USA
bitshifter
Ultimately you want to collect input for each number into buffer.
Then process it and print the result.
That way you wouldnt be limited to numbers less than 99 as result.

Anyway, i put some notes and made it work, somehow :S
Code:
; make .COM program
org 100h

; enter 80*25 video mode
mov ax,03h
int 10h

; print prompt to enter first 2 digit number
mov dx, message
mov ah,9
int 21h

; get 10'ths of first number
xor ah,ah
int 16h
mov bh,al

; get 1'ths of first number
xor ah,ah
int 16h
mov bl,al

; print prompt to enter second 2 digit number
mov ah,9
int 21h

; get 10'ths of second number
xor ah,ah
int 16h
mov ch,al

; get 1'ths of second number
xor ah,ah
int 16h
mov cl,al

; print header for results
mov dx, result
mov ah,9
int 21h

; -statecheck-
;
; BH = 10.ths of first number
; BL = 1'ths of first number
; CH = 10'ths of second number
; CL = 1'ths of second number
;

; add numbers together (very cheezy)
add bl,cl
sub bl,30h

add bh,ch
sub bh,30h

cmp bl,'9'
jle label_x
inc bh
label_x:

; print 10'ths of result
mov dl,bh
mov ah,2
int 21h

; print 1'ths of result
mov dl,bl
mov ah,2
int 21h

; wait for user to press any key
xor ah,ah
int 16h

; exit back to operating system
int 20h

; dos strings Smile
message: db 13,10,"enter 2 digit numbers: $"
result: db 13,10, "sum: $"
    

_________________
Coding a 3D game engine with fasm is like trying to eat an elephant,
you just have to keep focused and take it one 'byte' at a time.
Post 23 Feb 2010, 06:36
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