Merge pull request #911 from beingshub02/patch-1

Create Power_of_four.java

Author: Sirajmolla

LeetCode/Power_of_four.java

@@ -0,0 +1,17 @@
+class Solution {
+    public boolean isPowerOfFour(int n) {
+        if(n==0){
+            return false;
+        }
+        if(n%4!=0 && n !=1){
+            return false;
+        }
+        
+        if(n==1){
+            return true;
+        }
+        else{
+            return isPowerOfFour(n/4);
+        }
+    }
+}