update dir

static/static_variable.cpp

@@ -0,0 +1,24 @@
+// variables inside a class 
+
+#include<iostream> 
+using namespace std; 
+
+class GfG 
+{ 
+    public: 
+        static int i; 
+
+        GfG() 
+        { 
+            // Do nothing 
+        }; 
+}; 
+
+int GfG::i = 1; 
+
+int main() 
+{ 
+    GfG obj; 
+    // prints value of i 
+    cout << obj.i; 
+}