# Autobiographical Number in Java1 min read

In this tutorial, we will write an Autobiographical Number Program in Java and also learn what is Autobiographical Number.

## Autobiographical Number

An autobiographical number is a number such that the first digit of it counts how many zeroes are there in it, the second digit counts how many ones are there, and so on. Basically, it counts the frequency of digits from 0 to 9 in order which they occur in a number.

Example: 1210 has 1 zero, 2 ones, 1 two, and 0 threes.
Some other examples include 2020, 21200, 3211000, 42101000, etc.

Explanation: Consider a number, 21200.

First, the sum of the digits: 2+1+2+0+0 = 5
Second, count the number of digits: 5
Since the sum of the digits is equal to the number of digits present in a number. Therefore, 21200 is an autobiographical number.

## Java Program to check if the given number is Autobiographical Number or not

Output:

`//First Run Enter the number: 1210 1210 is an Autobiographical number. \\Second Run Enter the number: 1410 1410 is not an Autobiographical number.`

### Java Program to find the sum of the Largest Forward Diagonal

in this tutorial, we will write a java program to find the sum of the Largest Forward Diagonal in an Arraylist (matrix). Java Program to …

### C Program to search an element in an array using Pointers

A separate function( search_function()) will be created where the array pointer will be declared and the searched element along with the size of an array …

### C Program to find the sum of the digits of a number using recursion function

This C program calculates the sum of digits of a given number using recursion. Here’s a concise explanation: Function Definition: sumDigits(int n) This function calculates …

### C program to find factorial of a number using Ternary operator with Recursion

Recursion refers to the function calling itself directly or in a cycle. Before we begin, you should have the knowledge of following in C Programming: …

### C Program to Add Two Numbers Using Call by Reference

The program takes the two numbers from the user and passes the reference to the function where the sum is calculated. You may go through …

### Find the output ab, cd, ef, g for the input a,b,c,d,e,f,g in Javascript and Python

In this tutorial, we will write a program to find a pairs of elements from an array such that for the input [a,b,c,d,e,f,g] we will …