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using namespace std;
 
class A {
  public:
    double p1, p2;
    virtual double fun(p1,p2) = 0;
};
 
class B: public A {
  public:
    double fun(p1,p2) {
    	cout << p1+p2;
	};
};
 
class C: public A {
  public:
    double fun(p1,p2) {
		cout << p1-p2;
	};
};
 
void proc(A** a) {
	a[0]->fun();
}
 
int main() {
  B b;
  C c;
  A* a[2];
  a[0]=&b;
  a[1]=&c;
 
  proc(a);
}

prog.cpp:6:24: error: ‘p1’ is not a type
prog.cpp:6:27: error: ‘p2’ is not a type
prog.cpp:11:16: error: ‘p1’ is not a type
prog.cpp:11:19: error: ‘p2’ is not a type
prog.cpp: In member function ‘virtual double B::fun(int, int)’:
prog.cpp:12:6: error: ‘cout’ was not declared in this scope
prog.cpp:13:2: warning: no return statement in function returning non-void [-Wreturn-type]
prog.cpp: At global scope:
prog.cpp:18:16: error: ‘p1’ is not a type
prog.cpp:18:19: error: ‘p2’ is not a type
prog.cpp: In member function ‘virtual double C::fun(int, int)’:
prog.cpp:19:3: error: ‘cout’ was not declared in this scope
prog.cpp:20:2: warning: no return statement in function returning non-void [-Wreturn-type]
prog.cpp: In function ‘void proc(A**)’:
prog.cpp:24:12: error: no matching function for call to ‘A::fun()’
prog.cpp:24:12: note: candidate is:
prog.cpp:6:20: note: virtual double A::fun(int, int)
prog.cpp:6:20: note:   candidate expects 2 arguments, 0 provided

Standard output is empty