- #include <cstdio> 
-   
- class A { 
- public: 
- 	int n; 
- 	A(); 
- 	~A(); 
- }; 
-   
- A::A() = default; 
- A::~A() = default; 
-   
- class B { 
- public: 
- 	int n; 
- 	B() = default; 
- 	~B() = default; 
- }; 
-   
- int main() { 
- 	A a; 
- 	B b; 
- 	printf("A: %d; B: %d\n", a.n, b.n); 
- 	return 0; 
- } 
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