expending macro between double quotes

[puzzlecracker]

In this silly example say I want NUM macro to expend in printf?

#include<cstdio >
using namespace std;

#define NUM 10
int main(){

printf(" NUM \n");
return 0;
}

I don't need solutions of this type printf(" %d \n", NUM); since in
the production code I don't have this luxury. For now, I use make_str
on top of the call.

Thanks