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

Not exactly that but ...

#include 

#define MTEST_
#define MTEST__(x) printf("%d\n",x)
#define MACRO_TEST(x)\
    printf("this is a test\n");\
    MTEST_##x    

int main(void)
{
    MACRO_TEST();
    MACRO_TEST(_(5));
    return 0;
}

EDIT

And if 0 can be used as skip:

#include 

#define MACRO_TEST(x) \
    do { \
        printf("this is a test\n"); \
        if (x +0) printf("%d\n", x +0); \
    } while(0)

int main(void)
{
    MACRO_TEST();
    MACRO_TEST(5);
    return 0;
}