Put a variable value inside a Compiler Directives

[Jesuino]

Hi, Good Morning!
I want to print a variable value inside a preprocessor directive! E.g.:

#define D(value) value


main(){
char[] test = "testing";
D(test); //I wanna send the value of test, and not the name of the variable
}


I already saw this in a C book, but i dont remember the name of the book...

Could Someone Help-me?

Thanks in advanced!!

[helios]

Impossible. Macros are expanded before even starting compiling, so there's no way to pass something that doesn't exist, yet.
Maybe this is what you're trying to do? http://www.cplusplus.com/forum/beginner/11252/

[Jesuino]

Oh, Ok!

I'll Explain my project.
I'm making a programming language on top of C to improve the generation of report. So, we don't need lose more time with "printf" and anothers I/O functions.

The basic idea is use a language XML to generate the out of report. To interpret this language I use a file with the configuration and the semantic of the tags used in XML. Now, I would make a improvement, allowing the user to add some codes in configuration file. But, i'll need to try another way to make it!!

Thanks a lot!

[kbw]

#include <iostream>

#define D(value) { std::cout << #value "=" << value << std::endl; }

int main()
{
        for (int value = -2; value < 3; ++value)
        {
                int j = 2*value;
                D(value);
                D(j);
        }

        return 0;
}