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v4 _fixed(x) math

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Joules

Joined: 02 Mar 2006
Posts: 9

v4 _fixed(x) math

Posted: Mon Aug 27, 2007 11:18 am

trying to port some old code that used some float math to 4.051, I was planning on using only fixed vars now.

first, when I declare the var (I know this is probably a stupid question):

Code:

signed _fixed(2) int16 stuff;

when I hover over stuff later on the popup says "variable VOID:FP2 stuff" the "void" has me nervous. is this declaring what I think it is; a number between -327.68 and 327.68?

When I assign int values to fixed vars, it should be transparent, right?

Code:

signed int16 int_stuff = 123;
signed _fixed(2) int16 fixed_stuff;

fixed_stuff = int_stuff; // fixed_stuff should = 123.00 now
fixed_stuff *= 0.54; // fixed_stuff should = 66.42
int_stuff = fixed_stuff; // int_stuff should = 66

one more question: when I multiply or add different fixed numbers, when does truncation happen?

Code:

signed int16 _fixed(1) fix1 = 1.2;
signed int16 _fixed(2) fix2 = 1.23;
signed int16 _fixed(2) answer;

answer = fix1 * fix2;

what is answer now?

Thanks[/code]

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