执行下列程序的输出结果是______: #include<iostream> using namespacestd; class TestClassl { public: void funl(){cout<<"TestClassl\n";} virtual void fun2() {cout<<"TestClassl\n";} }; class TestClass2:public TestClass1 { public: void fun1(){ cout<<",TestClass2\n";} void fun2(){cout<<",TestClass2\n";} }; void f(TestClass1&b)(b.fun1();b.fun2();} int main() { TestClass2 obj; f(obj); retum 0; }