what is the best way to determine is a double is not zero

Question

关于确定双倍的任何建议都不是零？

Answer 1

You have to set an epsilon that is compatible with the problem you are solving. Then, you could use something like

bool DoubleEquals(double value1, double value2)
{
    return Math.Abs(value1 - value2) < epsilon;
}

EDIT
Since you asked a way to determine if a double is not zero, you could use this function by writing:

if (!DoubleEquals(value, 0)) { /* do your not zero things */ }

I felt this method was better because it's more general purpose.

Answer 2

Hi depends on what sort of calculations you are doing. Some times you get a very small number which is close to 0 but not quite

I usually do

if (Math.Abs(MyNumber) < 1e-10)

Hope it helps

Answer 3

if ( Math.Abs(doubleNumber) > Math.Pow(1,-9) ) //doubleNumber not zero.

Answer 4

This much is enough to check the double is zero or not

        double d = 0.00000005;
        bool l =  d.Equals(0);