derived classes

Code:

---

#include <cstdlib>
#include <iostream>

using namespace std;

class Stack {
      public:
            class Underflow { };
            class Overflow { };
            class Bad_Size { };
           
            virtual void push(char c) = 0;
            virtual char pop() = 0;
};

class Array_stack : public Stack {
      char *p;
      int max_size;
      int top;
      public:
            Array_stack(int s);
            ~Array_stack();
           
            void push(char c);
            char pop();
};

Array_stack::Array_stack(int s) //cant compile
{
            if(s > 10000)
                throw Bad_Size();
            p = new char[s];
            max_size = s;
            top = 0;                     
}
int main()
{
   
     
     
}

---

Why wont this work?

How can i define a constructor that's declared inside a derived class, but i want to define it outside of the class itself?

What is the compile error?

Oh nvm. The problem is i didnt define the push/pop functions.

Seems like you cant just define the constructor, if you define the constructor you have to define all of the functions in the class aswell.