Created Exercise 17 Even Digit

Exercise 17 - Even Digit Sum (Question and Answer)/EvenDigitSum.java

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+
+
+public class EvenDigitSum {
+    public static void main(String[] args){
+        System.out.println(getEvenDigitSum(1234));
+    }
+    public static int getEvenDigitSum(int number){
+        //initialisation
+        int sum = 0;
+        int box = 0;
+        // invalid options
+        if (number < 0) {
+            return -1;
+        }
+            while (number >= 0) {
+                if (number % 2 == 0) {
+                    sum = number % 10;
+                    box += sum;
+                }
+                number /= 10;
+
+            }
+            return box;
+
+    }
+}
+
+//    Even Digit Sum
+//        Press Write a method named getEven DigitSum with one parameter of type int called number.
+//        The method should return the sum of the even digits within the number.
+//        If the number is negative, the method should return - 1 to indicate an invalid value.
+//        EXAMPLE INPUT/OUTPUT:
+//        •
+//               getEvenDigitSum(123456789); – should return 20 since 2 + 4 + 6 + 8 = 20 
+//               getEvenDigitSum(252); – should return 4 since 2 + 2 = 4 
+//               getEvenDigitSum(-22); → should return -1 since the number is negative
+//