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#include <iostream>
using namespace std;
 
class Oblast
{
	public :
	char name [64];
	void show_Oblast(void)
	{
		cout << "Название: " << name << endl;
 
};
 
class Megapolis : public Oblast
{
 
};
 
class Gorod : public Megapolis
{
 
};
 class Mesto : public Gorod
 {
 
 };
int main()
{
	Mesto A;
	strcpy(A.name, "Tolyatti");
	A.show_Oblast();
 
    return 0;
}

prog.cpp:14:26: error: invalid use of incomplete type ‘class Oblast’
 class Megapolis : public Oblast
                          ^
prog.cpp:4:7: error: forward declaration of ‘class Oblast’
 class Oblast
       ^
prog.cpp:34:1: error: expected ‘}’ at end of input
 }
 ^
prog.cpp: In member function ‘int Oblast::main()’:
prog.cpp:30:11: error: ‘class Oblast::Mesto’ has no member named ‘name’
  strcpy(A.name, "Tolyatti");
           ^
prog.cpp:30:27: error: ‘strcpy’ was not declared in this scope
  strcpy(A.name, "Tolyatti");
                           ^
prog.cpp:31:4: error: ‘class Oblast::Mesto’ has no member named ‘show_Oblast’
  A.show_Oblast();
    ^
prog.cpp: At global scope:
prog.cpp:34:1: error: expected unqualified-id at end of input
 }
 ^

Standard output is empty