DIV questions.

flat assembler
Message board for the users of flat assembler.

Index > Main > DIV questions.

Author

Thread

Teehee

Joined: 05 Aug 2009
Posts: 570
Location: Brazil

Teehee

152 / 100 = 1.52

Code:

mov eax, 152
mov ebx, 100
cdq
div ebx
; eax = 1

To where .52 goes?

_________________
Sorry if bad english.

27 Dec 2009, 19:39

Fanael

Joined: 03 Jul 2009
Posts: 168

Fanael

You mean the remainder? Check EDX.

27 Dec 2009, 20:03

windwakr

Joined: 30 Jun 2004
Posts: 827
Location: Michigan, USA

windwakr

No, he means the fractional part. Integer maths don't have fractional parts, they just get truncated towards 0.

You would need to use the FPU to have a fractional part, or you could use fixed-point maths.

_________________
----> * <---- My star, won HERE

27 Dec 2009, 20:21

Borsuc

Joined: 29 Dec 2005
Posts: 2465
Location: Bucharest, Romania

Borsuc

In decimal: Multiply numerator by 100, the numbers <100 can be considered fractional.

In binary: Multiply by a power of 2, the respective bits can be used as fractional bits.

27 Dec 2009, 20:46

Teehee

Joined: 05 Aug 2009
Posts: 570
Location: Brazil

Teehee

Oh, nice. Thank you guys.

27 Dec 2009, 21:06

< Last Thread | Next Thread >

Forum Rules:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum