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Hello (La)TeX'ers

I`ve got a nice problem (I guess). In my master's thesis I`ve some
pieces of C-code. I want to number the lines so I can refer to
them in the text. Question 1: How can I automaticly number these
lines, and these lines only. I have a couple of parts which
sould be numbered in sequence. So:

%code part one
\begin{verbatim}
1. main() {
2.   printf("Hellow World\n");
3. }
\end{verbatim}

%some text

%code part two

\begin{verbatim}
4. dummy() {
5.    printf("This is a dummy\n");
6. }
\end{verbatim}

I want to be able to insert some new lines without losing the
numbering order.

Question 2: Now I want to explain something about the code in my
text. How can I refer to these line numbers. for example

The string ``Hello world'' is printed in line 2.

Could someone answer these questions? 

Regards,

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