how to divide or multiply percentages in masm32

[mahmudkais]

hello

how to divide or multiply percentages in masm32 ??

some example code please to learn ??

thanks

[mahmudkais]

i found it and it is simple

1000 * 0.006  =   (1000 * 6 )/1000  = 6


MOV   EAX, 1000
mov ebx,6
mul   ebx
mov ebx,1000

div   ebx


thanks

[hutch--]

mahmudkais,

If you are going to be doing much number crunching, have a look at Ray Filiatreault's floating point maths library included in the masm32 sdk, simple interger maths have their place but for more complex work the floating point capacity is a lot more powerful.

[mahmudkais]

thanks
i will

[donkey]

If your just doing simple percentages the FPU is a bit of overkill, mostly they can be done using integer math as you posted above. To save a few clock cycles you can get rid of the DIV instruction...

http://blogs.msdn.com/devdev/archive/2005/12/12/502980.aspx

Edgar

[BlackVortex]

There is a tiny tool that does this, Magic Divider. I mean breaks down the divisions  to multiplication using a constant. Attached.