How to print a pound / hash via C preprocessor?

Question

I need help doing the following:

a preprocessor macro label(x) shall output \"#x\", e.g.,

#define label(x) ...

if I call label(anam

Answer 1

You can do something like this:

#define f(x) x
#define label(a) f(#)a

I tested this by running it directly through cpp (the C preprocessor) instead of through gcc. Example:

cpp test > test.html

Using the cpp that is part of gcc version 4.0.1.

The only problem I noticed is that I get some extra unwanted output, namely the first 4 lines of the file are as follows:

# 1 "test"
# 1 ""
# 1 ""
# 1 "test"