#include <iostream>
#include <cmath>
using namespace std;
 
class triangle
{
private:				//members
	int a;				//declarations
	int b;
	int c;
 
//Area = sq rt{s(s - a)(s - b)(s - c)}
 
public:					//methods "functions"
	triangle();			//declarations but no deffinitions
 
	void set_a(int d);
	void set_b(int e);
	void set_c(int f);
 
	int calc_perimeter();
	double calc_area();
};
 
// definitions of methods (not-inline vs. inline)
 
triangle::triangle() //refers to method in rectangle class
{
 
	a = 5;
	b = 16;
	c = 15;
 
	// Triangle inequality theorem: A + B > C, B + C > A, A + C > B
}
 
 
 
void triangle::set_a(int d)// for cin
{
	a = d;
}
void triangle::set_b(int e)// for cin
{
	b = e;
}
void triangle::set_c(int f)// for cin
{
	c = f;
}
 
int triangle::calc_perimeter() 
{
	return (a+b+c);
}
double triangle::calc_area()
{
	double s = (a+b+c)/2;
	return (sqrt(s*(s - a)*(s - b)*(s - c)));
}
 
int main()
{
	triangle t; // declaring OBJECT t of triangle class
 
	cout << "Perimeter: " << t.calc_perimeter() << endl << "Area: " << t.calc_area() << endl;
 
	cout << "Enter three sides of triangle Remember A + B > C, B + C > A, A + C > B: ";
	int g,h,i = 0;
	cin >> g >> h >> i;
 
	t.set_a(g);
	t.set_b(h);
	t.set_c(i);
 
	cout << "Perimeter: " << t.calc_perimeter() << endl << "Area: " << t.calc_area() << endl;
 
	return 0;
}