/* Distance.java
 * Author: Anders
 * 
 * Translated by: Jesper
 *
 * Execise 6:
 * Calculates the distance between a line 
 * and a point in the plane.
 */

import cs1.Keyboard;

public class Distance{
	
  public static void main(String[] args){
		
    // a and b of the equation 
    // is read from the keyboard.  	
    System.out.println("Type in the values of a and b for the equation " +
                       "y = a*x+b");
    System.out.print("a = ");
    double a = Keyboard.readDouble();	
    System.out.print("b = ");
    double b = Keyboard.readDouble();	
	
    // The coordinates of the point 
    // is read from the keyboard.
    System.out.println("Type in the coordinates of the point (x, y)");
    System.out.print("x = ");
    double x = Keyboard.readDouble();	
    System.out.print("y = ");
    double y = Keyboard.readDouble();	
	
    // The distance between the line 
    // and the point is printed
    double dist = Math.abs(a*x-y+b)/Math.sqrt(1+Math.pow(a,2)); 
    System.out.println("The distance between the line and the point is: " +
                       dist);		
	
  }// End of the main method
	
} // End of the class