Help needed with "simple" math calculation

[reywas]

Here's the code:

w9=0
main:
inc w9
w10 = w9*559/1150
debug
pause 2000
goto main

The problem:

when w9=117, w10=56 (that's correct)
when w9=118, w10= 0 (should be 57)

What's going on here?

Edit: Ok, I see that 118*559 is larger than 65535 and is over-running the register. I guess I need to scale the numbers in the equation.

w10=w9*56/115

 

[lbenson]

Nice. All in one post.

1) problem detected
2) condition where problem begins identified
3) cause of problem identified
4) solution provided (if accuracy sufficient for need is attained)