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  1. //This program calcuates the perimeter and the area of a triangle, given 3 lenghts.
  2. // Author: Eyal Oren
  3. // Date:
  4.  
  5. import java.util.Scanner;
  6. public class Triangle
  7. {
  8.     public static void main(String[] args)
  9.     {
  10.         Scanner scan = new Scanner(System.in);  //Creating a scanner to take input from user.
  11.         System.out.println("This program calculates the area "
  12.                             + "and the perimeter of the given triange. ");
  13.         System.out.println("Please enter the three lenghts "
  14.                             + "of the triangle's sides." );
  15.        
  16.         //defining the three lenghts type, perimeter type, area type, and a variable for future calculation, and asking the user for their value.
  17.         int a = scan.nextInt();
  18.         int b = scan.nextInt();
  19.         int c = scan.nextInt();
  20.         int peri, area, half_peri;
  21.        
  22.        
  23.         //Creating restricions for the lenghts of the triangle.
  24.         if (a > 0 && b > 0 && c > 0) //Declaring the lenghts won't be negative or zero.
  25.         {   if (a + b > c && b + c > a && a + c > b) //Declaring that the lengths will fulfill the triangle inequallity.
  26.                 //If all terms are vaild, proceeding to calculations.
  27.             {   peri = a + b + c;
  28.        
  29.                 half_peri = peri/2;
  30.        
  31.                 area = half_peri*(half_peri-a)*(half_peri-b)*(half_peri-c);
  32.        
  33.                 System.out.println("The perimeter is: " + peri + " The area is: " + area);
  34.            
  35.             }
  36.             else
  37.                 System.out.println("The lenghts doesn't fulfill the triangle inequallity, you entered: " + a + " " + b + " " + c);
  38.         }  
  39.  
  40.         else
  41.             System.out.println("The lenghts must be positive, you entered :" + a + " " + b + " " + c);
  42.            
  43.        
  44.  
  45.     } //end of method main
  46. } //end of class Triangle
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