c++多次delete的后果及正确处理方法

#include <iostream>

using namespace std;

class X
{
public:
int a;
};

int main(void)
{
X *x = new X;
cout<<x<<endl;
delete x;
cout<<x<<endl;
//多次delete 会爆异常
//delete x;
system("pause");
return 0;
}