Merge pull request #1117 from shellhub/feature

add pow

Maths/Pow.java

@@ -0,0 +1,26 @@
+package maths;
+
+public class Pow {
+    public static void main(String[] args) {
+        assert pow(2, 0) == Math.pow(2, 0);
+        assert pow(0, 2) == Math.pow(0, 2);
+        assert pow(2, 10) == Math.pow(2, 10);
+        assert pow(10, 2) == Math.pow(10, 2);
+    }
+
+    /**
+     * Returns the value of the first argument raised to the power of the
+     * second argument
+     *
+     * @param a the base.
+     * @param b the exponent.
+     * @return the value {@code a}<sup>{@code b}</sup>.
+     */
+    public static long pow(int a, int b) {
+        long result = 1;
+        for (int i = 1; i <= b; i++) {
+            result *= a;
+        }
+        return result;
+    }
+}

Maths/PowRecursion.java

@@ -0,0 +1,26 @@
+package Maths;
+
+public class PowRecursion {
+    public static void main(String[] args) {
+        assert pow(2, 0) == Math.pow(2, 0);
+        assert pow(0, 2) == Math.pow(0, 2);
+        assert pow(2, 10) == Math.pow(2, 10);
+        assert pow(10, 2) == Math.pow(10, 2);
+    }
+
+    /**
+     * Returns the value of the first argument raised to the power of the
+     * second argument
+     *
+     * @param a the base.
+     * @param b the exponent.
+     * @return the value {@code a}<sup>{@code b}</sup>.
+     */
+    public static long pow(int a, int b) {
+        if (b == 0) {
+            return 1;
+        } else {
+            return a * pow(a, b - 1);
+        }
+    }
+}