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    #include <iostream>
    using namespace std;
 
    class Oblast
    {
    public :
    int name ;
    void show_Oblast(void)
    {
    cout << "Название: " << name << endl;
 
    };
 
    class Megapolis : public Oblast
    {
 
    };
 
    class Gorod : public Megapolis
    {
 
    };
    class Mesto : public Gorod
    {
 
    };
    int main()
    {
    Oblast A;
    strcpy(A.name = 10);
    A.show_Oblast();
 
    return 0;
    }

prog.cpp:14:30: error: invalid use of incomplete type ‘class Oblast’
     class Megapolis : public Oblast
                              ^
prog.cpp:4:11: error: forward declaration of ‘class Oblast’
     class Oblast
           ^
prog.cpp:34:5: error: expected ‘}’ at end of input
     }
     ^
prog.cpp: In member function ‘int Oblast::main()’:
prog.cpp:30:23: error: ‘strcpy’ was not declared in this scope
     strcpy(A.name = 10);
                       ^
prog.cpp: At global scope:
prog.cpp:34:5: error: expected unqualified-id at end of input
     }
     ^

Standard output is empty