Neon Number

Neon Number is a number whose sum of digits of it’s square is equal to the original number.

Example 1: 9. 9² = 81. 8+1=9. We observe that the sum of digits of the square of original number is equal to the original number. Hence it is a Neon Number.

Example 2: 11. 11² = 121. 1+2+1 = 4. Here the sum of digits of the square of original number is not equal to the original number. Hence it is not a Neon Number.

#include <stdio.h>
void main()
{
    int n=0,r=0,s=0,nCopy=0;
    printf("Enter a number: ");
    scanf("%d",&n);
    nCopy=n;
    n=n*n;
    while(n>0)
    {
        r=n%10;
        s=s+r;
        n=n/10;
    }
    if(s==nCopy)
    {
        printf("%d is a Neon Number",nCopy);
    }
    else
    {
        printf("%d is not a Neon Number",nCopy);
    }
}