Question

Java

1. Create an application named NumbersDemo whose main() method holds two integer variables. Assign values to the variables. In turn, pass each value to methods named displayTwiceTheNumber(), displayNumberPlusFive(), and displayNumberSquared(). Create each method to perform the task its name implies.

2. Modify the NumbersDemo class to accept the values of the two integers from a user at the keyboard.

This is the base code given:

public class NumbersDemo {
public static void main (String args[]) {
// Write your code here
}
public static void displayTwiceTheNumber(int n) {
// Write your code here
}
public static void displayNumberPlusFive(int n) {
// Write your code here
}
public static void displayNumberSquared(int n) {
// Write your code here

}
}

Answer 1

public class NumbersDemo {
    public static void main(String args[]) {
        int n1 = 10;
        int n2 = 7;
        displayTwiceTheNumber(n1);
        displayNumberPlusFive(n1);
        displayNumberSquared(n1);
        displayTwiceTheNumber(n2);
        displayNumberPlusFive(n2);
        displayNumberSquared(n2);
    }

    public static void displayTwiceTheNumber(int n) {
        System.out.println(2 * n);
    }

    public static void displayNumberPlusFive(int n) {
        System.out.println(n + 5);
    }

    public static void displayNumberSquared(int n) {
        System.out.println(n * n);
    }
}

import java.util.Scanner;

public class NumbersDemo {
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        int n1 = in.nextInt();
        int n2 = in.nextInt();
        displayTwiceTheNumber(n1);
        displayNumberPlusFive(n1);
        displayNumberSquared(n1);
        displayTwiceTheNumber(n2);
        displayNumberPlusFive(n2);
        displayNumberSquared(n2);
    }

    public static void displayTwiceTheNumber(int n) {
        System.out.println(2 * n);
    }

    public static void displayNumberPlusFive(int n) {
        System.out.println(n + 5);
    }

    public static void displayNumberSquared(int n) {
        System.out.println(n * n);
    }
}