Sunny Number in Java

Situatie

Sunny Number

A number is called a sunny number if the number next to the given number is a perfect square. In other words, a number N will be a sunny number if N+1 is a perfect square.

Let’s understand it through an example.Suppose, we have to check if 80 is a sunny number or not. Given, N=80 then N+1 will be 80+1=81, which is a perfect square of the number 9. Hence 80 is a sunny number.

Let’s take another number 10.

Given, N=10 then N+1 will be 10+1=11, which is not a perfect square. Hence 10 is not a sunny number.

Steps to Find Sunny Number

The logic is very simple. To find the sunny number, we need only to check whether N+1 is the perfect square or not.

Read or initialize a number (num).
Add 1 to the given number i.e. num+1.
Find the square root of num+1.
If the square root is an integer, the given number is sunny, else not a sunny number.

Backup

import java.util.*;
public class SunnyNumberExample1
{
//driver code 
public static void main(String args[])
{
Scanner sc = new Scanner(System.in);
System.out.print(“Enter a number to check: “);
//reading a number from the user
int N=sc.nextInt();
//calling user-defined function 
isSunnyNumber(N);
}
//function checks whether the given is a perfect square or not 
static boolean findPerfectSquare(double num)
{
//finds the square root of the ggiven number
double square_root = Math.sqrt(num);
//if square root is an integer 
return((square_root – Math.floor(square_root)) == 0);
}
//function that checks whether the given number is Sunny or not
static void isSunnyNumber(int N)
{
//checks N+1 is perfect square or not
if (findPerfectSquare(N + 1))
{
System.out.println(“The given number is a sunny number.”);
}
//executes if N+1 is not a perfect square
else
{
System.out.println(“The given number is not a sunny number.”);
}
}
}

Output 1:

Enter a number to check: 80
The given number is a sunny number.

Output 2:

Enter a number to check: 670
The given number is not a sunny number.

Solutie

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