[Mingw-users] About memory exhaustion twice

[min li <lee...@gm...>]

#include<iostream>
using namespace::std;
int main()
{
  int* pi=new int(1);
 delete pi;
 delete pi;
 return 0;
}

I use GCC. When I delete the "pi" twice, the program will not report
error,Why?  I compil the same code under VC and BC and run it, the program
will report an error. Please help me and talk in detail, thanks a lot.