Family Day update

Task/Exponentiation-operator/Kotlin/exponentiation-operator.kotlin

@@ -3,19 +3,19 @@
 infix fun Int.ipow(exp: Int): Int =
     when {
         this ==  1 -> 1
-        this == -1 -> if (exp % 2 == 0) 1 else -1
+        this == -1 -> if (exp and 1 == 0) 1 else -1
         exp <  0   -> throw IllegalArgumentException("invalid exponent")
         exp == 0   -> 1
         else       -> {
             var ans = 1
             var base = this
             var e = exp
-            while (e > 0) {
+            while (e > 1) {
                 if (e and 1 == 1) ans *= base
                 e = e shr 1
                 base *= base
             }
-            ans
+            ans * base
         }
     }