diff --git a/Sorted.java b/Sorted.java
index e06c3b3..f8ed377 100644
--- a/Sorted.java
+++ b/Sorted.java
@@ -1,5 +1,5 @@
 public class Sorted {
-    public static void isSorted(int arr[], int idx){
+    public static Boolean isSorted(int arr[], int idx){
         //base condition
         if(idx==arr.length-1){
             return true;
diff --git a/fact.java b/fact.java
index cceff90..81b386a 100644
--- a/fact.java
+++ b/fact.java
@@ -6,7 +6,7 @@ public static void printFactorial(int n){
         if(n<0){
             System.out.println("invaild number");
         }
-        int factorial= 0;   
+        int factorial= 1;   
         for(int i=n; i>=1; i--){
             factorial= factorial*i;
         }
diff --git a/pattern12.java b/pattern12.java
new file mode 100644
index 0000000..4396bc5
--- /dev/null
+++ b/pattern12.java
@@ -0,0 +1,14 @@
+public class pattern12 {
+    public static void main(String[] args) {
+        int num = 5;
+        for (int i = 0; i<num;i++){
+            for(int j = 0; j< num-i;j++){
+                System.out.print(" ");
+            }
+            for (int j = 0; j<=i;j++){
+                System.out.print(i+1+" ");
+            }
+            System.out.println();
+        }
+    }
+}
diff --git a/sum.java b/sum.java
index 3681331..f04f036 100644
--- a/sum.java
+++ b/sum.java
@@ -3,8 +3,8 @@ public class sum {
     //find the sum of two number 
     public static void main(String[] args) {
         int number1= 4;
-        int number2= 5
+        int number2= 5;
         int sum = number1 + number2;
         System.out.println(sum);
     }
-}
\ No newline at end of file
+}
diff --git a/xPown.java b/xPown.java
index 3f93fe7..60a79ec 100644
--- a/xPown.java
+++ b/xPown.java
@@ -4,13 +4,24 @@ public class xPown {
     //base case at oth and 1th
     
     public static int calcPower(int X, int n){
+        if(X == 0){
+            return 0;
+        }
+        if(n == 0){
+            return 1;
+        }
         //operation
         int xPownm_1= calcPower(X, n-1);
         int xPown= X*xPownm_1;
+        
         return xPown;
     }
     public static void main(String[] args) {
+        int ans1= calcPower(2,5);
+        int ans2= calcPower(2,7);
         int ans= calcPower(2,0);
         System.out.println(ans);
+        System.out.println(ans2);
+        System.out.println(ans1);
     }
 }