Number Pattern

Part of the Fundamentals section of Coddy's Java journey — lesson 71 of 73.

When creating patterns like pyramids, we often need to create strings with repeated characters. Here's a useful technique to create such strings:

String str = new String(new char[10]).replace("\0", "a");

str will hold "aaaaaaaaaa"

Let's break down how this works:

new char[10] creates an array of 10 characters, each initialized to '\0' (null character)
new String(new char[10]) converts this array to a string of 10 null characters
replace("\0", "a") replaces each null character with 'a'

It is important to write "\0" and not “0”

Challenge

Easy

Each test case has one input - an odd whole number.
Your task is to print n - pyramid using *, here are some examples:

1 - pyramid

5 - pyramid

*
***
*****

7 - pyramid

*
***
*****
*******

Input

odd integer n from user
1 <= n < 1000

Tips

Try starting from the small triangles
Check the hint if you are stuck ;)

n represents the number of * in the bottom row

Cheat sheet

To create strings with repeated characters in Java:

String str = new String(new char[10]).replace("\0", "a");

This creates a string with 10 'a' characters: "aaaaaaaaaa"

How it works:

new char[10] creates an array of 10 characters, each initialized to '\0' (null character)
new String(new char[10]) converts this array to a string of 10 null characters
replace("\0", "a") replaces each null character with 'a'

Important: Use "\0" (null character) and not "0" (zero character)

Try it yourself

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt();
    }
}