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/*fileName:P5Q16.java
*Name:Wang Chaoran
* Description:
16 (The MyTriangle class)
Create a class named MyTriangle that contains the following two methods:
//Returns true if the sum of any two sides is greater than the third side.//
public static boolean isValid(double side1, double side2, double side3)
// Returns the area of the triangle.//
public static double area(double side1, double side2, double side3)
The formula for computing the area is
Write a test program that reads three sides for a triangle and computes
the area if the input is valid. Otherwise, it displays that the input is invalid.
*/
 
  import java.util.Scanner;
  public class P5Q16{
 
  public static void main(String[] args){
    Scanner scan = new Scanner(System.in);
    System.out.println("Please enter side1: ");
    double side1 = scan.nextDouble();
    System.out.println("Please enter side2: ");
    double side2 = scan.nextDouble();
    System.out.println("Please enter side3: ");
    double side3 = scan.nextDouble();
    if(isValid(side1,side2,side3))
      System.out.println("The area of the triangle is "+area(side1,side2,side3));
      else
      System.out.println("The input is invalid.");
  }
 
  public static boolean isValid(double side1, double side2, double side3){
  if((side1+side2)>side3)
    if((side1+side3)>side2)
    if((side2+side3)>side1)
    return true;
  return false;
  }
 
  public static double area(double side1, double side2, double side3){
    double s = (side1 + side2 + side3)/2;
    return Math.sqrt(s*(s-side1)*(s-side2)*(s-side3));
  }

}