amstrong.java

public class Armstrong {
	int power(int x, long y)
	{
		if (y == 0)
			return 1;
		if (y % 2 == 0)
			return power(x, y / 2) * power(x, y / 2);
		return x * power(x, y / 2) * power(x, y / 2);
	}
	int order(int x)
	{
		int n = 0;
		while (x != 0) {
			n++;
			x = x / 10;
		}
		return n;
	}

	boolean isArmstrong(int x)
	{
		int n = order(x);
		int temp = x, sum = 0;
		while (temp != 0) {
			int r = temp % 10;
			sum = sum + power(r, n);
			temp = temp / 10;
		}

		return (sum == x);
	}

	public static void main(String[] args)
	{
		Armstrong ob = new Armstrong();
		int x = 153;
		System.out.println(ob.isArmstrong(x));
		x = 1253;
		System.out.println(ob.isArmstrong(x));
	}
}