Hello Andrew,
So, for the following code, I get something I think is a little off.
I get the same value for all three variable types. I'm kind of new to
this, but I would think that a 32 bit would give me a different
"smallest value" than a 64 bit or 80 bit (if real even evaluates to 80
bit on my machine).
What am I doing wrong, or is this a bug?
This is a classic case of the optimizer getting in your way by doing all
the math in the FPU (the other classic cases is it noting that as long as
ep!=0, ep+n "can't" equal n). If you are on x86 than the only type the FPU
uses inside is 80bit-real.
import std.stdio;
void main() {
//Find Machine Epsilon:
double ep = 1.0;
double n = 1.0;
while (ep + n != n) {
ep = ep / 2;
}
writefln(ep);
real epr = 1.0;
real nr = 1.0;
while (epr + nr != nr)
epr = epr / 2;
writefln(epr);
float epf = 1.0;
float nf = 1.0;
while (epf + nf != nf)
epf = epf / 2;
writefln(epr);
}
