#ifndef AbstractClass_h
#define AbstractClass_h
class Class
{
public:
	typedef double(Class::* ykaz)(double);
	virtual double pervaia(double x)=0;
	double neww (double a, double b);
	double func(ykaz y, double x); 
};

#endif

#include "stdafx.h"
#include "Class.h"
#include <iostream>

using namespace std;


double Class:: func(ykaz y, double x)
{
	double deltaX = 0.0000001;
	return (((this->*y)(x + deltaX) - (this->*y)(x)) / deltaX);

}

double Class::neww(double a, double b) 
	{
		double deltaX = 0.0000001;
		double otv, min, otvv, otvvv, x, aa, c;

		otv = func(pervaia, a);
		otvv = func(pervaia, a + deltaX);
		otvvv = (otvv - otv) / deltaX;
		min = otvvv;
		aa = a;

		for (int i = 0; i <= b - a; i++)
		{
			x = aa;
			cout << "x=" << x << '\t';
			otv = func(pervaia, x);
			otvv = func(pervaia, x + deltaX);

			otvvv = (otvv - otv) / deltaX;
			cout << otvvv << endl;

			if (min > otvvv)
			{
				min = otvvv;
			}
			aa++;
		}
		return min;
	}

#include "stdafx.h"
#include <iostream>
#include "Class.h"

using namespace std;

class MyClass : public Class {
	virtual double pervaia(double x)
	{
		return pow(x, 4) + pow(x, 3);
	}
};


int main()
{
	MyClass l;
	cout << "Input the interval: " << '\n';
	cout << "MIN: " << l.neww(3,6) << endl;
	system("pause");
    return 0;
}