Buzz Number Java

Buzz number is another special number in Java that ends with digit 7 or divisible by 7. Unlike Prime and Armstrong numbers, the Buzz number is not so popular and asked by the interviewers.

In simple words, a number is said to be Buzz if it ends with 7 or is divisible by 7.

Let's take some examples of Buzz numbers.

42 is a Buzz number because it is divisible by 7.
107 is a Buzz number because it ends with 7.
147 is a Buzz number because it ends with 7 and also divisible by 7.
134 is not a Buzz number because it is neither end with 7 nor divisible by 7.

These are the following steps that we use to check whether the given number is a Buzz number or not.

We first take a number.
We then find the last digit of the number and check whether it is equals to 7 or not. If it equals 7, print "the number is a Buzz" number.
We then find the remainder of the number with 7. If the remainder equal to 0, print "the number is a Buzz number".
Else print "number is not a buzz number".

Let's implement a program to check whether the user entered number is a Buzz number or not.

BuzzNumberExample.java

//import required classes and packages
import Java.util.*; 
import java.io.*; 
import java.util.Scanner;

//create BuzzNumberExample class to check whether the given number is Buzz number or not
class BuzzNumberExample { 
  
    // create checkNumber() method that returns true when it founds number Buzz 
    static boolean checkNumber(int number) 
    { 
        // check whether the number ends with 7, is divisible by 7 or not
        if(number % 10 == 7 || number % 7 == 0)
			return true;	//returns true when the number is Buzz
		else
			return false;	//returns flase when the number is not Buzz
    } 
  
    // main() method start
    public static void main(String args[]) 
    {	
		int n1, n2;
		
		//create scanner class object to get input from user
		Scanner sc=new Scanner(System.in);
		
		//show custom message
		System.out.println("Enter first number");
		
		//store user entered value into variable n1
		n1 = sc.nextInt();
		
		//show custom message
		System.out.println("Enter second number");
		
		//store user entered value into variable n2
		n2 = sc.nextInt();
		
        if (checkNumber(n1)) 
            System.out.println(n1 + " is a Buzz number"); 
        else
            System.out.println(n1 + " is not a Buzz number"); 
        if (checkNumber(n2)) 
            System.out.println(n2 + " is a Buzz number"); 
        else
            System.out.println(n2 + " is not a Buzz number"); 
    } 
} 

Output

Let's implement one more program to get all the Buzz number in a given range

FindAllBuzzNumbers.java

//import required classes and packages
import java.util.*; 
import java.io.*; 
import java.util.Scanner;

//create FindAllBuzzNumber class to get all the Buzz number in a given range
class FindAllBuzzNumbers
{
	//main() method start
	public static void main(String args[])
	{
		int range;
		
		//create scanner class object
		Scanner sc=new Scanner(System.in);
		
		//show custom message
		System.out.println("Enter the value of range");
		
		//store user entered value into variable range
		range = sc.nextInt();

		for(int i = 1; i <= range; i++)
			checkNumber(i);
	}

	 // create checkNumber() method to check Buzz number
    static void checkNumber(int number) 
    { 
        // check whether the number ends with 7, is divisible by 7 or not
        if(number % 10 == 7 || number % 7 == 0)
			System.out.println(number + " is an Buzz number");
    }

}

Output