有如下程序: #include <iostream> using namespace std; class Test { public: Test() {n+=2;} ~Test() {n-=3;} static int getNum(){retum n;} private: static int n; }; int Test:: n=1; int main() { Test*p=new Test; delete p; cout<<'n='<<Test:: getNum()<<end1; return 0; };执行后的输出结果是______.