Create database without entering password at command line

["Nathan Thatcher" <n8thatcher@xxxxxxxxx>]

I am trying to automatically create a database right after installing
postgres. I launch the silent install (Windows) from my own executable
and once it is done I need to create a database, tables, etc. I am
trying to find a way to do this without having to explicitly enter the
password in at the command prompt. What is the best way to do this?

Thanks,
Nate