javalab18.java

import java.io.*;
import java.util.*;

class ArmstrongNumCounter {

    public static boolean isArmstrongNum(String st) {
        try {
            int num = Integer.parseInt(st);
            int temp = num, sum = 0;
            int digits = st.length(); 
    
            while (temp != 0) {
                int rem = temp % 10;
                sum += Math.pow(rem, digits); 
                temp /= 10;
            }
            return sum == num;
        } catch (NumberFormatException e) {
            return false; 
        }
    }
    

    public static List<Integer> countArmstrongNums(String filename) throws IOException {
        List<Integer> armstrongNumbers = new ArrayList<>();
        try (BufferedReader br = new BufferedReader(new FileReader(filename))) {
            String line;
            while ((line = br.readLine()) != null) {
                String[] words = line.split(" ");
                for (String word : words) {
                    if (!word.isEmpty() && isArmstrongNum(word)) {
                        armstrongNumbers.add(Integer.parseInt(word));
                    }
                }
            }
        } catch (Exception e) {
            System.out.println("Error: " + e.toString());
        }
        return armstrongNumbers;
    }
}

public class javalab18 {
    public static void main(String[] args) {
        String file = "C:\\Users\\Asus\\OneDrive\\Documents\\myNumFile.txt";
        try {
            ArmstrongNumCounter ob = new ArmstrongNumCounter();
            List<Integer> armstrongNums = ob.countArmstrongNums(file);

            System.out.println("Number of Armstrong numbers: " + armstrongNums.size());
            System.out.print("Armstrong Numbers: ");
            for (int num : armstrongNums) {
                System.out.print(num + " ");
            }
        } catch (IOException e) {
            System.out.println("IOException occurred: " + e.toString());
        }
    }
}