- #include <iostream> 
- #include <string> 
- using namespace std; 
-   
- class A 
- { 
- private: 
-    static std::string s; 
- public: 
-    void modify_string(); 
- }; 
-   
-  std::string A::s = "default"; 
-   
- void A::modify_string() 
- { 
- s = "something";  // Error here.  
- } 
-   
- int main() { 
- 	A a; 
- a.modify_string(); 
- 	// your code goes here 
- 	return 0; 
- } 
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