List a directory in a C program on Unix machines

[cys at caen.engin.umich.edu]

Hello everyone,
  I am currently writing a C program on Unix machines. What I want to
do is to store the file names in a directory into a character array.
So I can do something to those files. I want to use Unix system calls
to handle it. Could anyone help me out with that? 
  Thanks in advance.

--Jim
  hev7 at ub.cc.umich.edu