GPT bậc 2. Obfuscated

#include<stdio.h>
#include<conio.h>
#include<math.h>
#define _0 printf
#define _o float
#define __O sqrt
_o _(_o __, _o ___, _o ____){_o _____;_____ = ___*___-4*__*____;
  (__==0)?(___==0)?(____==0)?_0("VSN."):_0("VN."):_0("%0.2f",____/___)
  :(_____<0)?   _0("VN."):(_____>0)?_0("%0.2f\n%0.2f ",(-___+__O(_____))
  /(2*__),(-___-__O(_____))/(2*__)):_0("%0.2f ",(-___)/(2*__));}
int main(){
   _(1,5,6);
  getch();
}