Is it wrong to compare a double to 0 like this: doubleVariable==0?

Question

It is ok to do this?

double doubleVariable=0.0;
if (doubleVariable==0) {
   ...
}

Or this code would suffer from potential rounding problem

Answer 1

You should not use double for such comparision. double creates problem.
e.g double n1=0.55 double n2=100 then double ans=n1*n2 should be 55.0
but when you debug ans is 55.000000000000007. if(ans==55.0)
will fail. in such case you can face a problem.