有如下程序: #include <iostream> using namespace std; class test{ private: int a; public: test( ){cout<< constructor <<endl;} test(int A) {cout<<a<<endl;} test(const test &_test){ a=_test.a; cout<< copy constructor <<endl; } ~test(){cout<< destructor <<endl;} }; int main( ){ test A(3) return 0; } 程序的输出结果是
A.3 destructor
B.constructor destructor
C.copy constructor destructor
D.3