Code-Bin #989 - triangle class

triangle class
Posted by: Rob-Bot | December 1, 2010 @ 12:37am

C++ Code

#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;
}

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