Example: Swapping of Two Numbers without using Third Variable in Java language

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// Swapping of Two Numbers without using Third Variable in Java language
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);

        double p, q;

        System.out.println("----Enter the two integer or real numbers----");
        p = in.nextFloat();
        q = in.nextFloat();

        p = p - q;
        q = p + q;
        p = q - p;

        System.out.printf("\nAfter swapping, p = %.2f", p);
        System.out.printf("\nAfter swapping, q = %.2f\n", q);
    }
}