Create happynumbers.java

happynumbers.java

@@ -0,0 +1,42 @@
+// Iterative Solution
+class HappyNumber {
+    public boolean isHappy(int N) {
+
+        do {
+            N = HappyNumber(N);    
+        } while (N != 1 && N != 4);
+
+        if (N == 1) {
+        return true;
+        }
+    return false;
+    }
+
+    static int HappyNumber(int N) {
+
+        int sum = 0;
+        while (N > 0) {
+            int Rem = N % 10;
+            N /= 10;
+            sum += (Rem * Rem);
+        }
+        return sum;
+    }
+}
+
+
+// Recurive Solution
+class Solution {
+    public boolean isHappy(int n) {
+
+        int sum = 0;
+        while (n > 0) {
+            sum += (n % 10) * (n % 10);
+            n /= 10;
+        }
+        if (sum == 1) return true;
+        if (sum == 4) return false;
+
+        return isHappy (sum);
+    }
+}