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##
**What is Ugly Number **

Ugly numbers are those positive numbers whose only prime factors are 2, 3 or 5.

**Examples**

Number to check : 10

`Prime Factors : 2,5 `

Prime Factors only contain either 2,3 or 5 : Yes //10 is an Ugly number

` `

Number to check : 120

`Prime Factors : 2,3,5`

Prime Factors only contain either 2,3 or 5 : Yes //120 is an Ugly number

Below are examples of numbers that are NOT Ugly numbers.

Number to check : 19

`Prime Factors : 19`

Prime Factors only contain either 2,3 or 5 : No //19 is NOT an Ugly number

` `

Number to check : 42

`Prime Factors : 2,3,7`

Prime Factors only contain either 2,3 or 5 : No //42 is NOT an Ugly number

**List of Ugly numbers from 1 to 10 are:**1, 2, 3, 4, 5, 6, 8, 9, 10

**Read Also:**

**Happy Number in Java**

##
**Java Program for Ugly Number**

import java.util.Scanner;

public class JavaHungry { public static void main(String args[]) { System.out.println("Enter any number: "); Scanner scan = new Scanner(System.in); // Store the input number Integer inputNumber = scan.nextInt(); checkUglyNumber(inputNumber); } public static void checkUglyNumber(Integer inputNumber) { int num = inputNumber; /* Loop will run until num becomes 1 */ while(num != 1) { if (num % 2 == 0) num /= 2; else if (num % 3 == 0) num /= 3; else if (num % 5 == 0) num /= 5; else { System.out.println(inputNumber + " is NOT an Ugly Number"); /* Come out of the loop, method has void return type */ return; } } System.out.println(inputNumber + " is an Ugly Number"); } }

**Output:**

**Enter any number:**

**90**

90 is an Ugly Number

90 is an Ugly Number

##
**Algorithm for Ugly Number**

1. Store the *inputNumber*in

*num*variable.

2. Using while loop

a. Continue if 2, 3 or 5 are the factors of

*num.*

*b.*

*Break the loop and return empty if*

*num*has prime factors other than 2, 3 or 5.

3. If

*num*value becomes 1 during while loop then print

*inputNumber*is an Ugly number.

That's all for this post. Please mention in comments in case you have any questions related to the ugly number in java with examples.

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