import java.util.Scanner;

/**
 * Segment maintains information about a line segment
 * represented by a left and right value.  The line
 * segment knows it's length.
 * @author Sarah Heckman
 */
public class Segment {

   /** Left point of the segment */
   private int left;
   /** Right point of the segment */
   private int right;
   /** Length of the segment */
   private int length;

   /**
    * Constructs a line segment
    * @param left left point of the segment
    * @param right right point of the segment
    */
   public Segment(int left, int right) {
      this.left = left;
      this.right = right;
   }

   /**
    * Calculates the length of the segment and
    * stores the value in the length field. Also,
    * returns the length.
    * @return length of line segment
    */
   public int calculateLength() {
      length = right - left;
      return length;
   }

   /**
    * Starts the program and contains the user
    * interface
    * @param args command line args
    */
   public static void main(String [] args) {
      Scanner in = new Scanner(System.in);

      System.out.print("Enter left edge of segment 1: ");
      int l = in.nextInt();
      System.out.print("Enter right edge of segment 1: ");
      int r = in.nextInt();

      Segment seg1 = new Segment(l, r);

      System.out.print("Enter left edge of segment 2: ");
      l = in.nextInt();
      System.out.print("Enter right edge of segment 2: ");
      r = in.nextInt();

      Segment seg2 = new Segment(l, r);

      int len1 = seg1.calculateLength();
      int len2 = seg2.calculateLength();
 
      if (len1 == len2) {
         System.out.println("Segment lengths are equal");
      } else {
         System.out.println("Segment lengths are NOT equal");
      }
   }
}