What is this '#'?

[Roaring_Tiger]

Can anybody explain this??

#define P( x ) printf( #x " = %d\n", x ) ;

[itsme86]

It's called stringification. Here's a link: http://www.lns.cornell.edu/public/CO...p_1.html#SEC16

(It's amazing what a google search will turn up.)

[glUser3f]

Basically, in macros, #x is replaced with "x"

So:

P(varname)

Will become:

printf("varname" " = %d\n", varname);