automorphic_number.dart

/**
 * Given a number and you need to check if a number is Automorphic or not. 
 * A number is called Automorphic if the square of the number ends
 * with the number itself.
 * Input:
 * First line of input contains a number of integer data type.
 * Output:
 * A single line telling whether a number is Automorphic or not.
 *
*/

import 'dart:io';
import 'dart:math';

int Check_Automorphic(int n) {
  int square, temp, remainder, no_digits = 0;
  temp = n;
  square = n * n;
  int flag = 10;

  while (n != 0) {
    n = (n / 10).floor();
    no_digits++;
  }

  flag = pow(10, no_digits) as int;
  remainder = square % flag;

  if (remainder == temp)
    return 1;
  else
    return 0;
}

void main() {
  int num;
  print("Enter the number: ");
  num = int.parse(stdin.readLineSync()!);

  int result = Check_Automorphic(num);

  if (result == 1)
    print("$num is a Automorphic number");
  else
    print("$num is not a Automorphic number");
}

/*
 * Example:
 * Input:
 * 3
 * Output:
 * 3 is not a Automorphic number.
 * 
 * Input:
 * 25
 * Output:
 * 25 is a Automorphic number.
*/
/*
*Time complexity : O(n) 
*Space complexity : O(1)
*/