An Example Object

// triangle.h

class triangle
{
   public:
        // The Constructor
	triangle();

        // Member functions	
        void setTriangle(double side1, double side2,
                         double side3 );
	int valid();	
        double angle1(); // opposite side1
        double angle2(); // opposite side2
        double angle3(); // opposite side3

        double area();

  private:
	double s1, s2, s3;
};