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Number Programs

Java Program to Check Sunny Number

A Java program to check if a number is a Sunny number.

Problem Description

Write a Java program to check if a number is a Sunny number (a number N is sunny if N+1 is a perfect square).

Code

SunnyNumber.java
public class SunnyNumber {
    public static void main(String[] args) {
        int num = 80;
        double root = Math.sqrt(num + 1);

        if (root % 1 == 0)
            System.out.println(num + " is a Sunny Number.");
        else
            System.out.println(num + " is not a Sunny Number.");
    }
}

Output

80 is a Sunny Number.

Explanation

  1. Condition: Check if num + 1 is a perfect square.
  2. Math.sqrt: Returns the square root. Check if it's an integer.

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