Working of Digital filters...

So how do we get so many discrete value of h(n)............??

Hi,

I guess you mean like this:
h(n)={1,2,3,4,5,4,3,2,1}

or something like that.

If you look back at post #51, i presented a technique for finding the impulse response that involves integrating the continuous time h(t), and that formula produces a set of discrete values which we call h(n).