Абстрактные классы

void _tmain()
{
    const int lim = 100;
    MyFunction *pFunc [lim];
    int count = 0;
 
    pFunc[count++] = new My_Exp;
    pFunc[count++] = new Line;
    pFunc[count++] = new My_KX;
 
    for(int i = 0; i < count; i++)
       pFunc[i]->Calculate();
 
    for(int i = 0; i < count; i++)
       delete pFunc[i];
 
    _getch();
}

for(int i = 0; i < count; i++)

#ifndef FUNCTION_H
#define FUNCTION_H
class MyFunction{
    public:
       virtual ~MyFunction(void){}
       virtual char* GetName() = 0;
       virtual void Calculate() = 0;
    protected:
       double x;
};
#endif
 
 
#include <iostream.h>
#include <Math.h>
class My_LogAB: public MyFunction{
    public:
       My_LogAB(): name("Log(A, B)"){}
       char* GetName(){return name;}
       void Calculate();
    protected:
       char* name;
       double a;
       double b;
};
 
void My_LogAB::Calculate(){
   cout << "Calcutation for function y = " << name << endl;
   cout << "Enter a = "; cin >> a;
   cout << "Enter b = "; cin >> b;
   cout << "y = " << log(b) / log(a) << endl;
}
 
#include <iostream.h>
#include <Math.h>
class My_Exp: public MyFunction{
    public:
       My_Exp(): name("e ^ x"){}
       char* GetName(){return name;}
       void Calculate();
    protected:
       char* name;
};
 
void My_Exp::Calculate(){
   cout << "Calcutation for function y = " << name << endl;
   cout << "Enter x = "; cin >> x;
   cout << "y = " << exp(x) << endl;
}
 
 
#include <iostream.h>
#include <Math.h>
class Line: public MyFunction{
    public:
       Line(): name("a * x + b"){}
       char* GetName(){return name;}
       void Calculate();
    protected:
       char* name;
       double a;
       double b;
};
 
void Line::Calculate(){
   cout << "Calcutation for function y = " << name << endl;
   cout << "Enter a = "; cin >> a;
   cout << "Enter b = "; cin >> b;
   cout << "Enter x = "; cin >> x;
   cout << "y = " << (a * x + b) << endl;
}