Programming Forums > Application Development > Assembly

Wizard1988 · Oct 9th, 2005, 12:33 PM

I am trying to print out contents of an array, I can assemble and link my code, but the output is wrong.

Here is my code

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.model small
.stack 100h

.data
	array8 db 10h,20h,30h,40h
.code
	extern Writeint:proc, Crlf:proc
main proc
	mov ax, @data
	mov ds, ax
	
	mov bx, offset array8
	mov ax, [bx]
	mov bx,16
	call Writeint
	
	mov ax,4c00h
	int 21h
		
main endp
end main

When I run the executable I get 2010. I know this has something to do with byte flipping or somethign like that. Does anyone know how I can fix this?

Thanks for any input

DaWei · Oct 9th, 2005, 3:21 PM

It has to do with endianness. You can Google on that. You can reverse the bytes (there's even an instruction to do that). You can treat them as bytes instead of 16-bit entities. Pay your money, take your choice. Prolly help to read your documentation, too. This has been treated on the forum before, but you'd have to search with some appropriate term ("swap bytes" might be one).

maro25 · Oct 12th, 2005, 1:47 AM

I am not sure what writeint really does! What arguments does it take?
If all arguments are correct, then it would be the endianness

Wizard1988 · Oct 12th, 2005, 9:15 PM

Wrteint takes AX as an argument, I forgot to set it to 0 before I moved the variable into AX.

Thanks for the input

Oct 9th, 2005, 12:33 PM	#1
Wizard1988 Professional Programmer Join Date: Oct 2005 Location: Chitown Posts: 417 Rep Power: 4	Displaying contents of an array I am trying to print out contents of an array, I can assemble and link my code, but the output is wrong. Here is my code (Toggle Plain Text) .model small .stack 100h .data array8 db 10h,20h,30h,40h .code extern Writeint:proc, Crlf:proc main proc mov ax, @data mov ds, ax mov bx, offset array8 mov ax, [bx] mov bx,16 call Writeint mov ax,4c00h int 21h main endp end main .model small .stack 100h .data array8 db 10h,20h,30h,40h .code extern Writeint:proc, Crlf:proc main proc mov ax, @data mov ds, ax mov bx, offset array8 mov ax, [bx] mov bx,16 call Writeint mov ax,4c00h int 21h main endp end main When I run the executable I get 2010. I know this has something to do with byte flipping or somethign like that. Does anyone know how I can fix this? Thanks for any input

Oct 9th, 2005, 3:21 PM	#2
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	It has to do with endianness. You can Google on that. You can reverse the bytes (there's even an instruction to do that). You can treat them as bytes instead of 16-bit entities. Pay your money, take your choice. Prolly help to read your documentation, too. This has been treated on the forum before, but you'd have to search with some appropriate term ("swap bytes" might be one). __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

Oct 12th, 2005, 1:47 AM	#3
maro25 Newbie Join Date: Oct 2005 Posts: 6 Rep Power: 0	I am not sure what writeint really does! What arguments does it take? If all arguments are correct, then it would be the endianness __________________ Password Spyer 2k: Password Recovery Software My NEW SEO forum

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Oct 12th, 2005, 9:15 PM	#4
Wizard1988 Professional Programmer Join Date: Oct 2005 Location: Chitown Posts: 417 Rep Power: 4	Wrteint takes AX as an argument, I forgot to set it to 0 before I moved the variable into AX. Thanks for the input

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Programming Forums > Application Development > Assembly

Displaying contents of an array