How to print a variable's name in C++? [duplicate]

Question

Possible Duplicate:
Programmatic way to get variable name in C?

I have checked some of the blogs before posting this here. I have tried the following snippet...

int a=21;

int main()
{
   cout<<#a<<a<<endl;
   return 0;
}

I am using g++ compiler on ubuntu 10.04. And I am getting the following error:

sample.cpp:17: error: stray ‘#’ in program. 

Please suggest me how to print the variables name .

Answer 1

The # stringifying macro thing only works inside macros.

You could do something like this:

#include <iostream>

#define VNAME(x) #x
#define VDUMP(x) std::cout << #x << " " << x << std::endl

int main()
{
  int i = 0;
  std::cout << VNAME(i) << " " << i << std::endl;

  VDUMP(i);

  return 0;
}