Introduction

A neon number is a positive integer, which is equal to the sum of the digits of its square.
For example, 9 is a neon number, because 9 squared = 81, and the sum of the digits 8 + 1 = 9, which is the same as the original number.
Write a program in C# to input an integer from the user, and check if that number is a Neon Number.
  1. using System;
  3. namespace ConsoleMultipleClass
  4. {
  5. class Program
  6. {
  7. static void Main(string[] args)
  8. {
  9. Program obj = new Program();
  10. obj.NeonNumber();
  11. Console.ReadLine();
  12. }
  14. void NeonNumber()
  15. {
  16. Console.WriteLine("Enter your number to check number is neon or not");
  17. int input = Convert.ToInt32(Console.ReadLine());
  19. int temp = input * input;
  21. string tempString = Convert.ToString(temp);
  23. char[] charArray = tempString.ToCharArray();
  26. int sum = 0;
  27. for (int i = 0; i < charArray.Length; i++)
  28. {
  29. string sumTemp = Convert.ToString(charArray[i]);
  30. sum += Convert.ToInt32(sumTemp);
  31. }
  33. if (sum == input)
  34. {
  35. Console.WriteLine("Number is neon");
  36. }
  37. else
  38. {
  39. Console.WriteLine("Number is not neon");
  40. }
  41. }
  42. }
  43. }

Summary

In this article, I have explained and provided examples of the neon number program in a simple way.