Re: Decimal number of interger?

[Jeffrey Carter <jeffrey.carter@boeing.com>]

tmoran@acm.org wrote:
> 
> >How do I determine weather the result from a function has a decimal part
> >or not?
>   x : float := function_value(y);
> begin
>   if float(integer(x)) = x then -- decimal part of x is zero
> 
> >I want to use the log function to se weather the width of the terrain is
> >(2^x)+1. In order to do this I want to use the following:
> >log2(width-1) = "float without decimal part"
>   test : interfaces.unsigned_32 := interfaces.unsigned_32(width-1);
> begin
>   if (test and (test-1)) = 0 then -- test (ie, width-1) is a power of 2.

This will probably work for the values expected from such an
application, but for the general case in which Width - 1 may not fit in
any integer type, the floating-point attribute 'Floor (or 'Truncation,
if the value may be negative) yields a floating-point value with no
fractional part.

-- 
Jeffrey Carter