open files in a loop in C

I have to open many small files in C. But the files are in the form a.001, a.002, .....a.00n.
I lke to open files in a loop.
like when int n = 1 open a.001
upto n=n open a.00n.

Can you please help me.

sprintf the filename and the number together and then use it to call fopen.

thank you very much