//Programmer: Lucas Turbiani

//Date(s): Start: May 20th End: May 25th

//Project: THR Calculator

//Description: This app will take the 3 sides of the triangle measures and tell you the area and perimeter

​

using System;

​

public class Program

{   //Checks to see if a triangle with sides a,b,and c can be formed!

    //Return: true if triangle can be formed

    //Return: fale if triangle cannot be formed

    public static bool isTriangle (double s1, double s2, double s3) {

        bool check = true; //assume triangle can be formed

​

        //false check

        if (s1>s2+s3 || s2>s1+s3 || s3>s1+s2)

            check = false;

​

        return check;

    }

​

    public static double getPerimeter(double s1, double s2, double s3){

​

​

        return s1+s2+s3;

    }

    public static double getArea(double s1, double s2, double s3){

        double s = getPerimeter(s1,s2,s3)/2;

        double area = Math.Sqrt(s*(s-s1)*(s-s2)*(s-s3)); 

        return area;

    }

​

    public static void Main()

    {

        Console.WriteLine("Welcome to Triangle Properties.");

​

        double s1=0;

        double s2=0;

        double s3=0;  //three side lengths

​

        do{

            if (s1<0)  //error messages for negative side lengths

                Console.WriteLine("Side 1 must be positive.");

            if (s2<0)

                Console.WriteLine("Side 2 must be positive.");

            if (s3<0)

                Console.WriteLine("Side 3 must be positive.");

​

            Console.WriteLine("Enter in side 1:");  //takes in length 1

            s1=Convert.ToDouble(Console.ReadLine());

​

            Console.WriteLine("Enter in side 2:");

            s2=Convert.ToDouble(Console.ReadLine());

​

            Console.WriteLine("Enter in side 3:");

            s3=Convert.ToDouble(Console.ReadLine());

​

            if(!isTriangle(s1,s2,s3)) //error message for non triangle

                Console.WriteLine("Triangle cannot be formed with given sides!");

​

        }while (s1<0 || s2<0 || s3<0|| !isTriangle(s1,s2,s3));  //error check to ensure sides are positive and triangle can be formed

​

​

        Console.WriteLine("Sides of triangle: " +s1+", "+s2+", "+s3);

​

        double perimeter 

            = getPerimeter(s1,s2,s3);

        double area

            =getArea(s1,s2,s3);

        //double area=

        Console.WriteLine("The area of the triangle is: "+area);

        Console.WriteLine("The perimeter of the triangle is: " +perimeter);

​

    }

}