%n format specifier program giving different outputs on different compilers. Why?

I was reading about %n format specifier in C at this question. But when I tried the following program on different C++ compilers, it gave me different outputs.

Why? What is the reason? Is there undefined or implementation defined behavior occurring?

#include<stdio.h>

int main()
{
  int c = -1;
  printf("geeks for %ngeeks ", &c);
  printf("%d", c);
  getchar();
  return 0;
}

Output:

Code blocks 13.12: (correct output)

geeks for geeks 10

Borland/CodeGear/Embarcadero C++: (correct output)

geeks for geeks 10

Orwell Dev C++:

geeks -1

Microsoft Visual Studio 2010:

Debug assertion failed ("'n' format specifier disabled",0)