Java: Test whether AB and CD are orthogonal or not

Java Basic: Exercise-235 with Solution

There are four different points on a plane: P(xp, yp), Q(xq, yq), R(xr, yr) and S(xs, ys).
Write a Java program to test whether AB and CD are orthogonal or not.

Input:
xp,yp, xq, yq, xr, yr, xs and ys are -100 to 100 respectively and each value can be up to 5 digits after the decimal point It is given as a real number including the number of.
Output: Yes or No.

Sample Solution:

Java Code:

 import java.util.*;
import static java.lang.Math.*;

class Main{
  public static void main(String args[]){
	  System.out.println("Input xp, yp, xq, yq, xr, yr, xs, ys:");
      Scanner scan = new Scanner(System.in);
      double x[] = new double[4];
      double y[] = new double[4];
      for(int i=0;i<4;i++){
        x[i] = scan.nextDouble();
        y[i] = scan.nextDouble();
      }
      double a = (x[0] - x[1]) * (x[2] - x[3]);
      double b = (y[0] - y[1]) * (y[2] - y[3]);
      if((float)a + (float)b == 0) 
		  System.out.println("Two lines are orthogonal.");
      else 
		  System.out.println("Two lines are not orthogonal.");
    }
  }

Sample Output:

Input xp, yp, xq, yq, xr, yr, xs, ys:
3.5 4.5 2.5 -1.5 3.5 1.0 0.0 4.5
Two lines are not orthogonal.

Pictorial Presentation:

Flowchart:

Java Code Editor:

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