/*
Author : Deepak Majeti
Date : 8/10/2008
Program: LAB7_Mon, Interval_Test.java
Report bugs to: mdeepak@iitk.ac.in
*/
/*
Use Interval class to develop a program which will take as input the endpoints of two
intervals I1 and I2 from command line. (Total four command line arguments).
For examples, if the arguments are 3 1 2 4, then I1 = (1, 3) and I2 = (2, 4). The
program should compute the following information about these intervals and print suitable
messages.
   • The length of Intervals I1 and I2 respectively.
   • The interval which is bigger, that is, the interval whose length is greater than the
     other.
   • Whether any of the intervals I1 and I2 is empty.
   • Whether any of the intervals contains the origin.
   • Whether the intervals I1 and I2 intersect, if yes, print the the interval which is
     intersection of these two intervals.
   • Print the distance between the intervals I1 and I2 .

*/
class Interval_Test{

	public static void main(String args[]){

		Interval I1,I2;
		double l1=0,r1=0,l2=0,r2=0;
		
		try{// if the user does not enter a number as an argument, catch the error and let the user know what the error is.
		//it is better because the error generated by the compiler could be hard to understand by the users who do not know about the code 
			l1=Double.parseDouble(args[0]);
		 	r1=Double.parseDouble(args[1]);
		 	l2=Double.parseDouble(args[2]);
		 	r2=Double.parseDouble(args[3]);
		 	
		}catch(Exception e){

			System.out.println("Please give four numbers as arguments");
			System.exit(0);

		}

		//make new Interval Objects
		I1=new Interval(l1,r1);
		I2=new Interval(l2,r2);
		System.out.println("The Intervals are:\nI1=["+I1.left+","+I1.right+"]\nI2=["+I2.left+","+I2.right+"]");

		System.out.println("The length of interval I1= "+I1.Length());
		System.out.println("The length of interval I2= "+I2.Length());

		//check for lengths
		if(I1.Length()>I2.Length())
			System.out.println("The length of interval I1 is greater than I2 ");
		else if(I2.Length()>I1.Length())
			System.out.println("The length of interval I2 is greater than I1 ");
		else
			System.out.println("The length of interval I1 is equal to I2 ");

		//check if empty
		if(I1.Isempty())
			System.out.println("I1 is empty");
		//check if empty
		if(I2.Isempty())
			System.out.println("I2 is empty");
		//check if the interval has origin, "0"
		if(I1.Contains(0))
			System.out.println("I1 contains the Origin");
		//check if the interval has origin, "0"
		if(I2.Contains(0))
			System.out.println("I2 contains the Origin");
		//check if intervals intersect
		Interval temp=I1.intersection(I2);
		if(!(temp.Isempty())){
			System.out.println("I1 and I2 Intersect");
			System.out.println("The intersection Interval is I=["+temp.left+","+temp.right+"]");
		
		}
		//calculate the distance between intervals
		System.out.println("The distance between I1 and I2= "+I1.Distance(I2));

	}

}