# 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: **

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