loss of accuracy using fabs

[Maurader]

I have the following simple code

double number1;
double number2 = .000000001;
number1 = fabs(number2);

and i get number1 as zero

can any body help me with why i'm losing the accuracy?

Thanks!

 

[Mongooses]

How are you determining the number is zero? What you have written will assign 1.0e-09 to number1 not zero. Maybe you are losing accuracy in your display.

HTH,
JC