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Java Programming Exercies

Java Exercises: Check whether a given number is an ugly number

Java Numbers: Exercise-1 with Solution

Write a Java program to check whether a given number is an ugly number.

In number system, ugly numbers are positive numbers whose only prime factors are 2, 3 or 5. First 10 ugly numbers are 1, 2, 3, 4, 5, 6, 8, 9, 10, 12. By convention, 1 is included.

Test Data: Input an integer number: 235

Java Code:

import java.util.Scanner;
public class Exercise1 {
       public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        System.out.print("Input an integer number: ");
        int n = in.nextInt();  		
        if (n <= 0) {
            System.out.print("Input a correct number.");
        }
		int x = 0;
        while (n != 1) {
            if (n % 5 == 0) {
                n /= 5;
            } else if (n % 3 == 0) {
                n /= 3;
            } else if (n % 2 == 0) {
                n /= 2;
            } else {
                System.out.print("It is not an ugly number.");
				x = 1;
				break;
            }
        }
        if (x==0)
		System.out.print("It is an ugly number.");
		System.out.print("\n");
	    }
}

Sample Output:

Input an integer number: 235                                                                                  
It is not an ugly number.

Flowchart:

Flowchart: Check whether a given number is an ugly number

Java Code Editor:

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