Add Krishnamurthy Number Detector

KrishnamurthyNumber.java

@@ -0,0 +1,58 @@
+import java.util.Scanner;
+
+/*
+ * A Krishnamurthy number (or strong number) is a number whose sum of the factorial of digits is equal to the number itself.
+ * For example 145, 1! + 4! + 5! = 1 + 24 + 120 = 145.
+ */
+public class KrishnamurthyNumber {
+    public static void main(String[] args) {
+        // Initialize the scanner class to take input
+        Scanner sc = new Scanner(System.in);
+
+        // Prompt the user for input
+        System.out.print("Enter number to check if it is Krishnamurthy or not : ");
+
+        // Take input
+        int num = sc.nextInt();
+
+        // Check if number is Krishnamurthy and print the desired message
+        if (isKrishnamurthy(num))
+            System.out.println("This number is a Krishnamurthy Number");
+        else
+            System.out.println("This number is not a Krishnamurthy Number");
+
+    }
+
+    /**
+     * This method checks if a number is Krishnamurthy or not
+     * @param number the number to check
+     * @return true if number is Krishnamurthy, false otherwise
+     */
+    public static boolean isKrishnamurthy(int number) {
+        // Store the sum of factorial of digits
+        int sum = 0;
+
+        // Copy n to temp
+        int temp = number;
+
+        // Calculate sum of factorial of digits
+        while (temp > 0) {
+            // Get the last digit
+            sum += factorial(temp % 10);
+
+            // Remove the last digit
+            temp /= 10;
+        }
+
+        // Check if sum is equal to n
+        return sum == number;
+    }
+
+    public static int factorial(int n) {
+        // 0! = 1
+        if (n == 0) return 1;
+
+        // n! = n * (n - 1)!
+        return n * factorial(n - 1);
+    }
+}