C ++ const

# Include <iostream>
Using namespace STD;
Class AA
{
 
Public:
AA (int s)
{
X = s;
}
Void setx (INT) const;
Void pp () const;
PRIVATE:
Int X;
 
 
 
};
Void AA: setx (INT s) const // The constant function cannot modify the member.
{
// X = s;
}
Void AA: pp () const
{
Cout <x <Endl;
}
Int main ()
{
Const aa a (3); // The const object can only call the const member function, so that the Member will not be modified illegally.
// A. setx (5 );
A. PP ();
Return 0;
}
A non-constant member function cannot be called by a constant member object because it may attempt to modify the data member of a constant.