diff --git a/membershipoprater.py b/membershipoprater.py
new file mode 100644
index 0000000..a8f1985
--- /dev/null
+++ b/membershipoprater.py
@@ -0,0 +1,9 @@
+
+# use of in 
+
+s='language'
+
+print('N' in s)
+print('u' in s)
+print("hello")
+print("hello)
\ No newline at end of file
diff --git a/squresortarray.cpp b/squresortarray.cpp
new file mode 100644
index 0000000..722cb50
--- /dev/null
+++ b/squresortarray.cpp
@@ -0,0 +1,22 @@
+#include <iostream>
+#include <vector>
+#include <algorithm>
+using namespace std;
+
+int main() {
+    vector<int> nums = {-4, -1, 0, 3, 10};
+	vector<int>ans;
+
+	for(int i=0;i<nums.size();i++){
+		ans.push_back(nums[i]*nums[i]);
+	}
+	sort(ans.begin(),ans.end());
+
+	cout<<"sorted array";
+
+	for(int i=0;i<nums.size();i++){
+		cout<<ans[i]<<" ";
+	}
+	cout<<endl;
+return 9;
+}
diff --git a/squresortarray.exe b/squresortarray.exe
new file mode 100644
index 0000000..d0caa81
Binary files /dev/null and b/squresortarray.exe differ
diff --git a/squresortarray.o b/squresortarray.o
new file mode 100644
index 0000000..f3b6d98
Binary files /dev/null and b/squresortarray.o differ
diff --git a/string.py b/string.py
new file mode 100644
index 0000000..547f038
--- /dev/null
+++ b/string.py
@@ -0,0 +1,11 @@
+
+s1='python'
+s2='Python'
+# use of is 
+print(s1 is s2) 
+#  is compaire on the basis of memory address
+
+#  == compaire on the basis of value
+print(s1==s2)
+
+