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

Question

In my A.h file:

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


        

Answer 1

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 
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;
}