Thread: Slopes/ Equations of a Line extended Code

Hi, need some help with this one. All I was asked was to find out if the three points are on the same line. I think that works. But I decided to go a little farther and try getting the equations of the relevant lines. That is where I am going wrong. All that is written in the Eclipse ( my IDE) console is the slopes or what I think is the slopes! Can anyone help please? By the way, this is revision. But I am very rusty and have never been a "Ace" programmer. Something I am trying to fix. Thanks in advance for any help given.

import java.util.*;
public class SameStraightLine
{
	public static void main(String[] args)
	{
		Scanner input= new Scanner(System.in);
		int x1,y1,x2,y2,x3,y3,m1,m2,m3,l1,l2,l3;
		int x= 120;char X = (char)x;
		int y=121; char Y= (char)y;
		Boolean SameLine= true;
		System.out.println("Please enter the x1 co-ordinate: ");
		x1=input.nextInt();
 
		System.out.println("Please enter the y1 co-ordinate: ");
		y1=input.nextInt();
 
		System.out.println("Please enter the x2 co-ordinate: ");
		x2=input.nextInt();
 
		System.out.println("Please enter the y2 co-ordinate: ");
		y2=input.nextInt();	
 
		System.out.println("Please enter the x3 co-ordinate: ");
		x3=input.nextInt();
 
		System.out.println("Please enter the y3 co-ordinate: ");
		y3=input.nextInt();
 
		m1=((y2-y1)/(x2-x1));
		m2=((y3-y2)/(x3-x2));
		m3=((y1-y3)/(x1-x3));
 
		l1=(y-y1-(m1*(x-x1)));
		l2=(y-y2-(m2*(x-x2)));
		l3=(y-y3-(m3*(x-x3)));
 
		System.out.println("The equation of the line l1 is: "+l1);
 
		System.out.println("The equation of the line l2 is: "+l2);
 
		System.out.println("The equation of the line l3 is: "+l3);
 
 
		if (l1==l2 && l2==l3)
		{
			System.out.println("It is "+SameLine+" that they lie on the same line");
 
		}
		else
 
		{
			System.out.println("It is "+(!SameLine)+" that they lie on the same line");
 
		}
	}
}

Can you post the program's output and explain what is wrong with it and show what it should be?
Also provide all the input required to execute the program. A very easy way to do that is by putting a String in the Scanner class's constructor:

Scanner input= new Scanner("1\n33\n5\n44\n4\n");

Can you make a line of code like the above with all the test data for the program to make for easier testing and to be sure the correct data is entered.