# C Program to Check the Number is a Neon Number or Not2 min read

1. Check if the entered number is Neon number or not in C.
2. Display all the Neon Number within a given range in C.

## Neon Numbers

A number is said to be a neon number if the sum of the digits of a square of the number is equal t the original number.

Example: 9 is a Neon number (see explanation in the diagram).

## C Program to Check the Number is a Neon Number or Not

The following program takes the user input for a number that the user wants to check for. Then square the number sum the digits using while loop but you can also sum the digits using for the loop, using the following code: `for(i = square; i > 0; i = i/10) { sum = sum + i % 10; }` instead of a while loop. And lastly, print the result accordingly to print the neon number.

Source Code:

The output of neon number in c programming.

## C Program to print all the Neon Number within a Range

Output:

`Enter lower range: 0 Enter the upper range: 10000 All the Neon numbers between 0 to 10000 are: 0 1 9`

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