Question

2. Write a program in Java to display a diamond pattern of asterisks.

Expected Output :

*

***

*****

*******

*********

***********

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

***********

*********

*******

*****

***

*

3. Write a Java program that reads a positive integer and counts the number of digits the number has.

e.g. Input is 14367, Output is 5.

Answer 1

import java.util.Scanner;


public class App {


	/**
	 * The start point of the program
	 * 
	 * @param args
	 */
	public static void main(String[] args) {
		Scanner keyBoard = new Scanner(System.in);


		int n, c, k, space = 1;
		System.out.print("Enter number of rows: ");
		n = keyBoard.nextInt();
		space = n - 1;


		for (k = 1; k <= n; k++) {
			for (c = 1; c <= space; c++) {
				System.out.printf(" ");
			}


			space--;


			for (c = 1; c <= 2 * k - 1; c++) {
				System.out.printf("*");
			}


			System.out.printf("\n");
		}


		space = 1;


		for (k = 1; k <= n - 1; k++) {
			for (c = 1; c <= space; c++) {
				System.out.printf(" ");
			}


			space++;


			for (c = 1; c <= 2 * (n - k) - 1; c++) {
				System.out.printf("*");
			}


			System.out.printf("\n");
		}


		keyBoard.close();


	}


}

import java.util.Scanner;


public class App {


	static int countDigits(int number) {
		int counter = 0;
		while (number != 0) {
			number = number / 10;
			counter++;
		}
		return counter;
	}


	/**
	 * The start point of the program
	 * 
	 * @param args
	 */
	public static void main(String[] args) {
		Scanner keyBoard = new Scanner(System.in);
		System.out.print("Enter any positve integer number: ");
		int number = keyBoard.nextInt();
		System.out.print("The number of digits in a decimal number is: " + countDigits(number));
		keyBoard.close();


	}


}