diff --git a/key.cpp b/key.cpp
new file mode 100644
index 0000000..d9a2735
--- /dev/null
+++ b/key.cpp
@@ -0,0 +1,29 @@
+#include <iostream>
+using namespace std;
+int main()
+{
+int size = 10;
+int array[size];
+for (int i = 0; i< size; i++)
+{
+cout<< "Index " <<i<< " ";
+cin>> array[i];
+}
+int key;
+cout<< "\nEnter the number you want to search: ";
+cin>>key;
+int ele = -1;
+for (int i = 0; i< size; i++)
+{
+if (array[i] == key)
+{
+ele = i;
+
+}
+}
+cout<< "\nThe index of number " << key << " is " <<ele<<endl;
+return 0;
+}
+
+
+