Question

I have defined a class A and derived a new class B from A .
I have overloaded SetData() function in class B.
When I tried to access SetData function of class B using object of B, compiler doesn’t permit it. Why is it so ?

class A{

 public :
       void SetData();    
};

class B : public A {

 public:
       void SetData(int);   
};

B b;
b.SetData() ; // error

Answer 1

OMG, no error message. -1 for you.

But let us use telepathy and guess your error message. You’re getting something like “symbol not found” because you try to call a function B::SetData() which doesn’t have a body. And it must have a body even if it does nothing and even if it’s declared in parent class! Try adding it into the body of your class

class B : public A {
 public:
       void SetData(int)
       {  /* add body here */ };   
};

or outside of it

class B : public A {

 public:
       void SetData(int);   
};
void B::SetData(int)
{
  //write it here
}