Where do I find the machine epsilon in C#?

Question

The machine epsilon is canonically defined as the smallest number which added to one, gives a result different from one.

There is a Double.Epsilon but t

Answer 1

LAPACK + DLAMCH, 64-bit INTEL processor, C#:

var pp = double.Epsilon; // pp = 4.94065645841247E-324
double p = NativeMethods.MachinePrecision('S'); // =DLAMCH('S') 
p = 2.2250738585072014E-308
double.MinValue = -1.7976931348623157E+308
double.MaxValue =  1.7976931348623157E+308