#include "stdafx.h"
#include <iostream>
#include <iomanip>
#include <windows.h>

using namespace std;

bool cmp(int xstart, int xend, bool f)
{
	if (f)
		return xstart <= xend;
	else
		return xstart >= xend;
}

int main()
{
	typedef double(*myf_1)(double, double, double);
	typedef double(*myf_math)(double, double);
	typedef const char*(*FName)();
	if (!(LoadLibraryEx(L"lab9dll.dll", 0, LOAD_LIBRARY_AS_DATAFILE)))
	{
		cout << "Library loading error" << endl;
		system("pause");
		exit(0);
	}
	HINSTANCE pdll = LoadLibrary(L"lab9dll.dll");
	myf_1 MyFunction = (myf_1)GetProcAddress(pdll, "myf_1");
	myf_math Function = (myf_math)GetProcAddress(pdll, "myf_math");
	FName Name = (FName)GetProcAddress(pdll, "FName");
	if (!(pdll && MyFunction && Function && Name))
	{
		cout << "Unknown functions" << endl;
		system("pause");
		exit(0);
	}
m1:	double eps = 0, xstart = 0, xend = 0, dx = 1, a = -1;
	cout << "eps = ";
	cin >> eps;
	cin.clear();
	cin.ignore(cin.rdbuf()->in_avail());
	cout << "x start = ";
	cin >> xstart;
	cin.clear();
	cin.ignore(cin.rdbuf()->in_avail());
	cout << "x end = ";
	cin >> xend;
	cin.clear();
	cin.ignore(cin.rdbuf()->in_avail());
	cout << "dx = ";
	cin >> dx;
	cin.clear();
	cin.ignore(cin.rdbuf()->in_avail());
	cout << "a = ";
	cin >> a;
	if ((eps <= 0) || ((xstart != xend) && (dx == 0)) || ((xstart < xend) && (dx < 0)) || ((xstart > xend) && (dx > 0) || cin.fail()))
	{
		cout << "\nError!\nTry again\n\n";
		cin.clear();
		cin.ignore(cin.rdbuf()->in_avail());
		goto m1;
	}
	printf("_____________________________________________________________________________________\n");
	printf("|%16s|%4s%-20s|%24s|%16s|\n", "x", "My ", Name(), Name(), "Delta");
	printf("-------------------------------------------------------------------------------------\n");
	bool flag = dx > 0 ? true : false;
	for (double myf, f; cmp(xstart, xend, flag); xstart = round((xstart + dx) * 10000000) / 10000000)
	{
		myf = MyFunction(eps, a, xstart);
		f = Function(a, xstart);
		printf("|%16.7lf|%24.7lf|%24.7lf|%16.7lf|\n", xstart, myf, f, sqrt(fabs(myf * myf - f * f)));
	}
	printf("-------------------------------------------------------------------------------------\n");
	double xid;
m2:	cout << "x ideal = ";
	if (!(cin >> xid))
	{
		cout << "\nError!\nTry again\n\n";
		cin.clear();
		cin.ignore(cin.rdbuf()->in_avail());
		goto m2;
	}
	printf("_____________________________________________________________________________________\n");
	printf("|%16s|%4s%-20s|%24s|%16s|\n", "eps", "My ", Name(), Name(), "Delta");
	printf("-------------------------------------------------------------------------------------\n");
	for (double myf, f, eps = 0.1; eps >= 0.0000001; eps *= 0.1)
	{
		myf = MyFunction(eps, a, xid);
		f = Function(a, xid);
		printf("|%16.7lf|%24.7lf|%24.7lf|%16.7lf|\n", eps, myf, f, sqrt(fabs(myf*myf - f * f)));
	}
	printf("-------------------------------------------------------------------------------------\n");
	FreeLibrary(pdll);
	system("pause");
	return 0;
}