The right way to compare a System.Double to '0' (a number, int?)

Question

Sorry, this might be a easy stupid question, but I need to know to be sure.

I have this if expression,

void Foo()
{
    System.Double so         


        

Answer 1

Here is the example presenting the problem (prepared in LinQPad - if you don't have it just use Console.Writeline instead of Dump method):

void Main()
{
    double x = 0.000001 / 0.1;
    double y = 0.001 * 0.01; 

    double res = (x-y);
    res.Dump();
    (res == 0).Dump();
}

Both x and y are theoretically same and equal to: 0.00001 but because of lack of "infinite precision" those values are slightly different. Unfortunately slightly enough to return false when comparing to 0 in usual way.