Fixed Point Rounding

Thanks for the reply Kaz,

But I'm concerned about the effect of rounding on the fractional part of the number. I used a similar algorithm to the basic one that you just specifed, and it works great. But, that was with plain integers. I now have to extend the system to include four fractional bits. I am just wondering if there is anything I have to do accomodate this change when I do the rounding. I know that multiplications and divisions have to be modified, and I know that addition and subtraction can just remain the same, as long as the location of the decimal point remains fixed. I just don't know about the rounding. I may just be making it more complicated than it really is.