90. 有如下程序：
#include <iostream>
using namespace std;
class Test
{
public:
Test(){n+=2;}
~Test(){n-=3;}
static int getNum(){return n;}
private:
static int n;
};
int Test::n=1;
int main()
{
Test*p=new Test;
delete p;
cout<<"n="<<Test::getNum()<<endl;
return 0;
}
执行后的输出结果是______。
