In this video, we will write C program to check the neon number. 

What is a Neon number?
A number is said to be a neon number, if and only if the sum of digits of the square of the number is equal to the same number.

For examples:
=> Square of 9 = 9²   = 81
=> Sum of the digits of the square = 8+1= 9
=> So, 9 is a Neon Number

=>Square of 6 = 6² = 36
=>Sum of the digits of the square = 3+6 = 9
=> Here, 6 is not equal to 9.
=> So, 6 is not a Neon Number.

Algorithm:

• Step 1: First, we find the square of the given number.
• Step 2: In the second step, find the sum of the digit of the square by using a loop.
• Step 3:The condition checksum is equal to the given number.
  • Step 3.1Print” true, the number is neon number”.
    Else
  • Step 3.2 Print ”False, the number is not neon number”.

Here in this video, we will see 3 various approaches for checking whether a number is a neon number or not:

1. Using while loop
2. Using recursive method
3. Using string function with for loop

C Program to check neon number: https://www.geeksforgeeks.org/c-program-to-check-neon-number/