//This program calcuates the perimeter and the area of a triangle, given 3 lenghts.
// Author: Eyal Oren
// Date:

import java.util.Scanner;
public class Triangle
{
    public static void main(String[] args)
    {
        Scanner scan = new Scanner(System.in);  //Creating a scanner to take input from user.
        System.out.println("This program calculates the area "
                            + "and the perimeter of the given triange. ");
        System.out.println("Please enter the three lenghts "
                            + "of the triangle's sides." );

        //defining the three lenghts type, perimeter type, area type, and a variable for future calculation, and asking the user for their value.
        int a = scan.nextInt();
        int b = scan.nextInt();
        int c = scan.nextInt();
        int peri, area, half_peri;


        //Creating restricions for the lenghts of the triangle.
        if (a > 0 && b > 0 && c > 0) //Declaring the lenghts won't be negative or zero.
        {   if (a + b > c && b + c > a && a + c > b) //Declaring that the lengths will fulfill the triangle inequallity.
                //If all terms are vaild, proceeding to calculations.
            {   peri = a + b + c;

                half_peri = peri/2;

                area = half_peri*(half_peri-a)*(half_peri-b)*(half_peri-c);

                System.out.println("The perimeter is: " + peri + " The area is: " + area);

            }
            else
                System.out.println("The lenghts doesn't fulfill the triangle inequallity, you entered: " + a + " " + b + " " + c);
        }

        else
            System.out.println("The lenghts must be positive, you entered :" + a + " " + b + " " + c);



    } //end of method main
} //end of class Triangle