// abc.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <iostream>
using namespace std;
extern "C" double func(double, double, double);
extern "C" double func1(double, double, double);
int main() {
	double a, b, k, x1, x2;
	cout << "a= ";
	cin >> a;
	cout << "b= ";
	cin >> b;
	cout << "c= ";
	cin >> k;
	x1 = func(a, b, k);
	cout << x1 << endl;
	x2 = func1(a, b, k);
	cout << x2;

	return 0;
}