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divide overflow issue

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divide overflow issue

 
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  #1
Jan 4th, 2009
Hi to all,
I wrote a code, and it gives me divide overflow, but the issue here is that when I run the program trough the debugger it works fine, but when I run the program in the dos mode it gives me Divide overflow error. here the code:
assembly Syntax (Toggle Plain Text) 
  1. prt_sig:
  2. 				mov		al,[bx+si]
  3. 				mov		ah,0
  4. 				;the maximum digit in a number is 3
  5. 				push	cx
  6. 				mov		cx,3
  7. 				pr:
  8. 					xor		dx,dx
  9. 					push	bx
  10. 					mov		bx,10
  11. 					div		bx
  12. 					add		dl,30h
  13. 					pop		bx	
  14. 					push	dx
  15. 					xor		ah,ah
  16. 					dec		cx
  17. 					cmp		cx,0
  18. 					jne		pr
  19. 					mov		cx,3
  20. 				prin:
  21. 					pop		dx
  22. 					mov		ah,02h
  23. 					int		21h
  24. 					loop	prin

tnx
Last edited by Ancient Dragon; Jan 4th, 2009 at 6:12 pm. Reason: add code tags
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Re: divide overflow issue

 
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Jan 5th, 2009
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Originally Posted by loudstil View Post
Hi to all,
I wrote a code, and it gives me divide overflow, but the issue here is that when I run the program trough the debugger it works fine, but when I run the program in the dos mode it gives me Divide overflow error. here the code:

tnx
Insert a CWD instruction right before the DIV instruction. This will sign-extend AX into the DX:AX pair needed for the ('dword' divided by 'word') division.

Nathan.
while (CPU is present) {some assembly required}
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Re: divide overflow issue

 
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Jan 5th, 2009
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Originally Posted by Evenbit View Post
Insert a CWD instruction right before the DIV instruction. This will sign-extend AX into the DX:AX pair needed for the ('dword' divided by 'word') division.

Nathan.
Thanks for the fast replay

I tried to put cwd before the DIV instruction, but it still gives me DIVIDE OVERFLOW.....
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