If you want the old Dunning-Huzinaga basis set, the notation is D95(d)

If you want the correlation-consistent one, the notation is cc-pvdz

See the Gaussian website(for a complete description of all the basis sets available  (www.gaussian.com/basissets)

I want DZP I.e. double zeta with polarization basis sets of Dunning and Huzinga

D95(d) is diffusion I guess, .... D95* or D95(p)

Is there any provision in Gaussian to restrict the the decimal places/ rounding off.

"Is there any provision in Gaussian to restrict the the decimal places/ rounding off"

What do you mean?? please describe it briefly...

Say input is of 4 digits after decimal place e.g. 1.2345

Then optimisation wud be done accordingly 

D95(d) IS Dunning-Huzinaga full double-zeta with a single set of d-functions (Dunning's exponents). If you want p's on H, the notation would be D95(d,p)

Diffuse functions would be added with the '+' suffix.

I recommend (again) you look at the Gaussian web-sitefor proper syntax and available basis sets. (www.gaussian.com/basissets)

For initial run you can use 6-311G*

For more accuracy, you can use cc-pVTZ.

Or you can see examples of input/output files at following:

http://cccbdb.nist.gov/gaufiles1x.asp

Thank u

how do we write/ express DZP basis sets in Gaussian 05 ?