import java.io.*;

  public class Slope
  {
     public static void main(String args [ ]) {
     
     	double y2, y1, x2, x1;
 	y2 =0;
	y1 =0;
	x2 =0;
	x1 =0;

	BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

	try 
	{
		System.out.print("\nY2 =");
		y2 = Double.parseDouble(reader.readLine( ));
		
		System.out.print("Y1 = ");
		y1 = Double.parseDouble(reader.readLine( ));
		
		System.out.print("X2 = ");
		x2 = Double.parseDouble(reader.readLine( ));
		
		System.out.print("X1 = ");
		x1 = Double.parseDouble(reader.readLine( ));
		
		reader.close ( );
	}
	catch (IOException ioe) 
	{
		System.out.println("An error accoured while calculating this equation try again");
	}
	catch (NumberFormatException nfe) 
	{
		System.out.println("An error accoured while calculating this equation try again");
	}
	
	System.out.println( "The slope is " + getSlope(y2,y1,x2,x1));
   }
   
   public static double getSlope(double y1, double y2, double x1, double x2)
	{
		double yValue = y2-y1;
		double xValue = x2-x1;
		double slope = yValue/xValue;
		
		return slope;
	}
}

//SLOPE

import java.io.*;
public class SLOPE  {
        public static void main(String args [ ]) {
                //Where the variables are declared
                String sone;
                String stwo;
                String sthree;
                String sfour;
                float one, two, three, four;
                double rise, run;
                BufferedReader reader;
                reader  =  new BufferedReader(new InputStreamReader(System.in));

                System.out.print("\nThe first x = ");
                // Where the user input is aquired
                try   {
                        sone = reader.readLine( );
                        System.out.print("The first y = ");
                        stwo = reader.readLine( );
                        System.out.print("The second x = ");
                        sthree = reader.readLine( );
                        System.out.print("The second y = ");
                        sfour = reader.readLine( );
                        //Converting the user input to floating numbers allowing negitives decimals ect to be used
                        one = Float.parseFloat(sone) ;
                        two = Float.parseFloat(stwo) ;
                        three= Float.parseFloat(sthree) ;
                        four = Float.parseFloat(sfour) ;

                        rise = four - two;
                        run = three - one;



                        //The answers
                        System.out.println("The rise = " + rise) ;
                        System.out.println("The run = " + run );
                        System.out.println("The slope is ");
                        System.out.println(rise);
                        System.out.println("____");
                        System.out.println(run);

                        reader.close ( );
                        //The exceptions if an error accours
                }
                catch (IOException ioe) {
                        System.out.println("Error");
                }
                catch (NumberFormatException nfe) {
                        System.out.println("Error");
                }


        }

}