Untitled

Variable arguements in macro using ellipsis
void test(char *var2)
{
 printf("%sn",var2);
}

#define PRINT_STRING(...) ( if (!var1) test(var2) )

int main(int argc, _TCHAR argv[]) {

PRINT_STRING(TRUE);
PRINT_STRING(FALSE,"Hello, World!");
return 0;
}

void print_string( bool should_print, ... )
{
    if( should_print )
    {
        va_list argp;
        va_start( argp, should_print);
        char *string = va_arg(argp, char *);
        if( string) printf("%s", string );
        va_end( argp );

    }
}

#define PRINT_STRING( should , args... ) print_string( should , ##args )

#include <stdbool.h>
#define PRINT_STRING0(X, Y) do { if (X && Y) test(Y); } while(false)
#define PRINT_STRING1(X, Y, ...) PRINT_STRING0(X, Y)
#define PRINT_STRING(...) PRINT_STRING1(__VA_ARGS__, 0, 0)

#include <stdio.h>

#define NUM_ARGS__(X,
                      N64,N63,N62,N61,N60,
  N59,N58,N57,N56,N55,N54,N53,N52,N51,N50,
  N49,N48,N47,N46,N45,N44,N43,N42,N41,N40,
  N39,N38,N37,N36,N35,N34,N33,N32,N31,N30,
  N29,N28,N27,N26,N25,N24,N23,N22,N21,N20,
  N19,N18,N17,N16,N15,N14,N13,N12,N11,N10,
  N09,N08,N07,N06,N05,N04,N03,N02,N01,  N, ...) N

#define NUM_ARGS(...)
  NUM_ARGS__(0, __VA_ARGS__,
                 64,63,62,61,60,
  59,58,57,56,55,54,53,52,51,50,
  49,48,47,46,45,44,43,42,41,40,
  39,38,37,36,35,34,33,32,31,30,
  29,28,27,26,25,24,23,22,21,20,
  19,18,17,16,15,14,13,12,11,10,
   9, 8, 7, 6, 5, 4, 3, 2, 1, 0)

#define PRINT_STRING_1(var)
  { if (!(var)) {} }

#define PRINT_STRING_2(var, ...)
  { if (!(var)) test(__VA_ARGS__); }

#define PRINT_STRINGN__(N, ...)
  PRINT_STRING_##N(__VA_ARGS__)

#define PRINT_STRINGN(N, ...)
  PRINT_STRINGN__(N, __VA_ARGS__)

#define PRINT_STRING(...)
  PRINT_STRINGN(NUM_ARGS(__VA_ARGS__), __VA_ARGS__)

void test(char* var2)
{
  printf("%sn", var2);
}

int main(void)
{
  PRINT_STRING(1);
  PRINT_STRING(0, "Hello, World!");
  PRINT_STRING(1, "You can't see me!");
  return 0;
}

Hello, World!