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How to multiply and divided in assemble

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happyreadygo
Advanced Cheater

Reputation: 1

Joined: 14 Sep 2011
Posts: 87

Posted: Mon Aug 20, 2012 7:48 am Post subject: How to multiply and divided in assemble

how can we multiply and divide a number in assemble? I search all the web but all only say about add , sub and little about lea , nothing say about divide .

However , I found something about using lea to mulitply.
If I want to multiply ecx by 2 , ecx = 0x1a0
I must using

Code:

lea ecx,[ecx*2]

If I want to multiply ecx by 3 , ecx = 0x1a0

Code:

lea ecx,[ecx+ecx*2]

I am still know not much about lea

Can someone show me an example of how to divide and multiply? are there any ceiling or floor when we divide the number?

* just found something interesting

Code:

mov edx,2
imul ecx,edx

this code multiply ecx by 2

Code:

imul ecx,2

but this code don't do anything and no eror.

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