As discussed, Tim, your version of R has already built-in all kinds of values
and limits and even ways to do approximate tests in the variable .Machine such
as:
> .Machine$double.eps
[1] 2.220446e-16
> .Machine$sizeof.longdouble
[1] 16
> .Machine$double.eps
[1] 2.220446e-16
> .Machine$longdouble
Floats have 23 bits of precision so the rounding is done there instead of
at 52 bits, hence a different example is needed to show the problem with
floats.
bill@Bill-T490:~$ cat b.c
#include
int main(int argc, char* argv[])
{
float d = 0.4 + 0.4 + 0.4 + 0.4;
printf("0.4+0.4+0.4+0.4 -> %24
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