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, sum of the digits: 2+1+2+0+0 = 5
Second, count the number of digits: 5
Since 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:


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