thanks for the reply.
I am not using random number seed.All the inputs are initialized.

On Sat, Jan 23, 2016 at 4:01 AM, Sean Luke <[log in to unmask]> wrote:
On Jan 22, 2016, at 1:32 AM, bijoy patwal <[log in to unmask]> wrote:

> I am always getting the same fitness for every evolution though .

Are you using the same random number seed?
        seed.0 = time