DefiniteIntegral_header

#pragma once
#define _CRT_SECURE_NO_WARNINGS

#include <cmath>
#include <iostream>
#include <string>
#include <cstring>
#include <cctype>

typedef double(*pointFunc)(double);

class DefiniteIntegral
{
public:
    DefiniteIntegral(pointFunc f, double leftBorder, double rightBorder);
    DefiniteIntegral(pointFunc f, double leftBorder, double rightBorder, double eps);

    double calculate(const char* method);
    int getAmountOfIterations(const char* method);

private:
    const double leftBorder;
    const double rightBorder;
    pointFunc f;
    double eps = 0.001;

    int calculateAmountOfIterations(double (DefiniteIntegral::*method)(int amountOfIterations));

    double leftRecktangleMethod(int amountOfIterations);
    double rightRecktangleMethod(int amountOfIterations);
    double centerRecktangleMethod(int amountOfIterations);

    double trapezeMethod(int amountOfIterations);

    double simpsonMethod(int amountOfIterations);

    double newtonMethod(int amountOfIterations);
};

char* toLowerCase(const char*);