Question

Write a method

public double square(double x)

that computes the square of the parameter x.

Answer 1

public double square(double x) {
    return x * x;
}

import java.util.Scanner;

public class SquareNumber {

    public double square(double x) {
        return x * x;
    }

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter a number: ");
        System.out.println("Square: " + new SquareNumber().square(in.nextDouble()));
    }
}