# Sunny Number in JAVA2 min read

In this tutorial, we will learn about Sunny numbers and create a Java program to check for sunny numbers. We will see two java examples on Sunny Number.

## What is Sunny Number?

A number `N` is said to be a sunny number if the number next to the given number` (N+1)` is a perfect square.

Example: Let us take a Number 8, then the next number is `8+1=9` and as 3 is a square root of 9, hence 8 is a sunny Number.

Another example, let the number be 5, then `5+1=6`, that has no square roots, hence 5 is not a sunny Number.

## Java Program to Check Whether the Number is Sunny Number or Not.

The program uses `Math.sqrt()` function that is an inbuilt function in Java.

Output:

`Enter the number: 80 80 is a Sunny number //Another Execution Enter the number: 6 6 is not a Sunny number`

## Java Program to find all the Sunny Number between a given Range

Output:

`Enter the lower range: 1 Enter the upper range: 100 The Sunny number between 1 and 100 are: 3 8 15 24 35 48 63 80 99`

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