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; } 执行该程序的输出结果是( )。