update dir

volatile/volatile.cpp

@@ -0,0 +1,16 @@
+/* Compile code with optimization option */
+#include <stdio.h> 
+
+int main(void) 
+{ 
+    const volatile int local = 10; 
+    int *ptr = (int*) &local; 
+
+    printf("Initial value of local : %d \n", local); 
+
+    *ptr = 100; 
+
+    printf("Modified value of local: %d \n", local); 
+
+    return 0; 
+}