DIV questions.

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Teehee

Joined: 05 Aug 2009
Posts: 570
Location: Brazil

Teehee 27 Dec 2009, 19:39

152 / 100 = 1.52

Code:

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

To where .52 goes?

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27 Dec 2009, 19:39

Fanael

Joined: 03 Jul 2009
Posts: 168

Fanael 27 Dec 2009, 20:03

You mean the remainder? Check EDX.

27 Dec 2009, 20:03

windwakr

Joined: 30 Jun 2004
Posts: 827

windwakr 27 Dec 2009, 20:21

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.

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27 Dec 2009, 20:21

Borsuc

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

Borsuc 27 Dec 2009, 20:46

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 27 Dec 2009, 21:06

Oh, nice. Thank you guys.

27 Dec 2009, 21:06

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