Main.cpp:12:2: error: C++ requires a type specifier for all declarations
        TestClass() { data = 0; }
        ^
Main.cpp:18:2: error: use of undeclared identifier 'TestClass'; did you mean 'TestClassClass::TestClass'?
        TestClass t;
        ^~~~~~~~~
        TestClassClass::TestClass
Main.cpp:12:2: note: 'TestClassClass::TestClass' declared here
        TestClass() { data = 0; }
        ^
Main.cpp:18:2: error: call to non-static member function without an object argument
        TestClass t;
        ^~~~~~~~~
Main.cpp:19:20: error: use of undeclared identifier 't'
        int* ptr = (int*)&t;
                          ^
Main.cpp:21:10: error: use of undeclared identifier 't'
        cout << t.getData();
                ^
5 errors generated.