25.10.2011 06:59, Matthew Brett kirjoitti:
> res = np.longdouble(2)**64
> res-1
> 36893488147419103231.0
Can you check if long double works properly (not a given) in C on that
platform:
long double x;
x = powl(2, 64);
x -= 1;
printf("%g %Lg\n", (double)x, x);
or, in case the platform doesn't have powl:
long double x;
x = pow(2, 64);
x -= 1;
printf("%g %Lg\n", (double)x, x);
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