🚀 go-pugleaf

The following prog is not working using gcc, any suggestion?

#include <stdio.h>

/* try to cat two string together using preprocessor */
#define CAT(a,b) \a\b

main()
{
   int var_p;

   var_p = 900;

   printf( "%d", CAT(var_,p) );
}


looks like the gcc adds extra blank after var_ and p when expanding the CAT.

plus, if I use
 
   printf( "%d", CAT(var_, p ) )

the preprocessor will copy the leading blank of p to expand CAT.
I am expecting it to skip the leading blank as a white char.

Please email me your comments. Thanks.