#include<iostream>
using namespace std;

class A{
public:
  void fun(){cout<<"fun\n";}
};

class B: public A{
  void fun(int i){cout<<"funB\n";}
};

int main()
{
  B b;
  b.fun();
}

In function 'int main()':
Line 16: error: no matching function for call to 'B::fun()'
compilation terminated due to -Wfatal-errors.