Update Armstrong.java

Optimized Armstrong number check by removing string conversion

Author: Patient-Pace-Coder

src/main/java/com/thealgorithms/maths/Armstrong.java

@@ -21,16 +21,14 @@ public class Armstrong {
      */
     public boolean isArmstrong(int number) {
         long sum = 0;
-        String temp = Integer.toString(number); // Convert the given number to a string
-        int power = temp.length(); // Extract the length of the number (number of digits)
+        int totalDigits = (int) Math.log10(number) + 1;; // get the length of the number (number of digits)
         long originalNumber = number;
 
         while (originalNumber > 0) {
             long digit = originalNumber % 10;
-            sum += (long) Math.pow(digit, power); // The digit raised to the power of the number of digits and added to the sum.
+            sum += (long) Math.pow(digit, totalDigits); // The digit raised to the power of the number of digits and added to the sum.
             originalNumber /= 10;
         }
-
         return sum == number;
     }
 }