Question

Using the IntelliJ IDEA tool, write a program that will print a Christmas tree with the "*". The tree should have at least 10 lines. Look back at the birthday cake lab for examples of how to do this lab. Submit a screen shot of your output in the console (i.e. non REPL tool).

Answer 1

Answer = We need to print Christmas Tree like pattern. The source code provided below is in Java language. Comments are shown by "//" operator at the starting of line.

Source Code :

// import scanner to take input from user

import java.util.Scanner;

public class ChristmasTree {

    static void showChristmasTree(int num) {

        // start loop to print Christmas Tree

        for (int i = 0; i < num; i++) {

            for (int j = 0; j < 2 * num; j++) {

                if ((num - 1 - i) <= j && j <= (num - 1 + i)) {

                    System.out.print("*");

                } else {

                    System.out.print(" ");

                }

            }

            System.out.print("\n");

        }

        // End loop

    }

    // Main Class

    public static void main(String[] args) {

        System.out.println("Enter number of rows to print Christmas Tree Pattern");

        Scanner scan = new Scanner(System.in);

        int num = scan.nextInt();

        // Call function to print Christmas tree

        showChristmasTree(num);

        scan.close();

    }

}

Output : Save the file with file name "ChristmasTree.java" and follow below commands to see output.

command (i) = javac ChristmasTree.java

command (ii) = java ChristmasTree

The screenshot of output is:

Here program ask user to give input of total rows, then display tree.