diff --git a/missing number b/missing number
new file mode 100644
index 0000000..5a01519
--- /dev/null
+++ b/missing number	
@@ -0,0 +1,26 @@
+#include<iostream>
+using namespace std;
+
+class Solution 
+{
+  public:
+    int missingNumber(vector<int>& nums) 
+    {
+        int a=nums.size();
+        for (int i=0;i<nums.size();i++)
+        {
+            a^=nums[i];
+            a^=i; 
+        }
+        return a;
+    }
+};
+int main()
+{
+  vector<int>arr={1,2,3,4,6,7,8,9};
+  int ans;
+  Solution object;
+  ans=object.missingNumber(arr);
+  cout<<ans;
+  return 0;
+}