有如下程序: #include(iostream) using namespace std; class TestClass{ protected: TestClass(){couti(cout<<‘x’} TestClass(char c){cout<<c;}} class TestClassl:publicTestClass{ public: TestClassl(char c){cout<<c;}}; int main(){ Te
【单选题】Doodle Corp. wants to increase customer loyalty toward its currently one-of-a-kind software, Bonkers EP. It does so by offering additional services like automatic updates and free upgrades. Which of t...