import static java.lang.Math.sqrt;
import java.util.Scanner;
class CalculateDistance {

public static void main (String args[])
{
	System.out.println("Enter two points, x1,y1,x2,y2 values");
	 Scanner in = new Scanner(System.in);
	 int x1 = in.nextInt();
        System.out.println("You entered integer " + x1);
         int y1 = in.nextInt();
        System.out.println("You entered integer " + y1);
         int x2 = in.nextInt();
        System.out.println("You entered integer " + x2);
         int y2 = in.nextInt();
        System.out.println("You entered integer " + y2);
        
        Line point1=new Line(x1,y1);
         Line point2=new Line(x2,y2);
        	System.out.println(calculateDistanceBetweenPoints(point1.getPointX(),point1.getPointY(),point2.getPointX(),point2.getPointY()));
}

public static class Line {

private int pointX;     //set instance variables
private int pointY;


public void setPoints() {       //method to set the points values
    pointX = 10;
    pointY = 10;

}

public Line(int x, int y){    //method to set arguments to instance variables 
    this.pointX = x;
    this.pointY = y;
}

/////////////////////////////////////////////////

public int getPointX() {
    return pointX;
}

public void setPointX(int x) {
    this.pointX = x;
}

///////////////////////////////////////////////

public int getPointY() {
    return pointY;
}

public void setPointY(int y) {
    this.pointY = y;
}

///////////////////////////////////////////////

public String toString(){                       //toString method to display the values
    return "(x,y) = (" + pointX + "," + pointY+")";
}

}

static public double calculateDistanceBetweenPoints(
  double x1, 
  double y1, 
  double x2, 
  double y2) {       
    return Math.sqrt((y2 - y1) * (y2 - y1) + (x2 - x1) * (x2 - x1));
}
}