Error: pure virtual method called - terminate called without an active exception - Aborted

In my A.h file:

class A{
  private:
    unsigned short PC;
  public:
    A():PC(0){}
    virtual ~A(){}
    virtual void execute(unsigned short PC)=0;
};

In my B.h file:

class B:public A{
  private: 
      int status;bool exe;
  public:
    B:status(0),exe(false){}
    virtual B(){}
    void execute (unsigned short PC);
};

In my B.cpp file:

#include <iostream>
#include "B.h"

void B::execute (unsigned short PC){
  cout << "Run";
}

In my Functions.h file :

#include "A.h"

class Functions{
  public: 
    int status;
    Functions():status(1){} // this is a constructer
    void run(A *a);
};

IN my Functions.cpp file:

#include "Functions.h"
#include "A.h"
#include "B.h"

using namespace std;
void Functions::run (A *a){
  a->execute();
}

In my Main.cpp file:

#include "A.h" 
#include 开发者_Go百科"B.h" 

int main(int args, char**argv){
  A *a;
  B b;
  a = &b;
  Functions f;
  f.run(a);
  return 1;
}

When I run , it has some error: pure virtual method called - terminate called without an active exception - Aborted Can anybody where did I misunderstand? Thank you

---

Usually you get this error when call your virtual function from constructor or destructor. Check that that is not the case.

(I assume that your demo code is not complete).

---

Don't know what you're doing but this, which is basically what you're showing us, except that is simplified and actually compiling, runs without any problems:

#include <iostream>

class A
{
public:
   virtual ~A() {}
   virtual void execute() = 0;
};

class B: public A
{
public:
   virtual void execute() {std::cout << "B::execute" << std::endl;}
};

void execute(A* a)
{
   a->execute();
}

int main()
{
   A* a;
   B b;
   a = &b;

   execute(a);

   return 0;
}

---

You wrote B() constructor without paranthesis , plus you have 2 B() default constructors, plus one of them is virtual(not good), plus when you execute a->execute, again you need paranthesis with an argument, because it is a function:

Try this:

#include <iostream>
using namespace std;

class A{
private:
unsigned short PC;
public:
A():PC(0){}
virtual ~A(){}
virtual void execute(unsigned short PC)=0;
};


class B:public A{
private:
    int status;
    bool exe;
public:
B():status(0),exe(false){}
//virtual B(){}
void execute (unsigned short PC);
};



void B::execute (unsigned short PC){
cout << "Run";
}



class Functions{
public: int status;
Functions():status(1){} // this is a constructer
void run(A *a);
};


void Functions::run (A *a){
a->execute(1);
}


int main(int args, char**argv){
A *a;
B b;
a = &b;
Functions f;
f.run(a);
return 1;
}

---

int main(int args, char**argv){
    A *a;
    B b; // wrong
    a = &b; // wrong
    Functions f;
    f.run(a);
    return 1;
}

you can do this :

int main(int args, char**argv){
    A *a = new B;
    //B b;
    //a = &b;
    Functions f;
    f.run(a);
    return 1;
}