How to define macro function which support no input parameter and support also input parametr in the same time

Question

I want to define a macro function which support at the same time:

1) No input parameter

2) Input parameters

some thing like that:

#de         


        

Answer 1

You can use sizeof for this purpose.

Consider something like this:

#define MACRO_TEST(X) { \
  int args[] = {X}; \
  printf("this is a test\n");\
  if(sizeof(args) > 0) \
    printf("%d\n",*args); \
}