@@ -19,11 +19,17 @@ You can't declare a variable of type **`void`**.
 ## Example
 
 ```cpp
+void  print_num(int num)
+{
+   std::cout << num << std::endl;
+}
+
 // void.cpp
 void vobject;   // C2182
 void *pv;   // okay
 int *pint; int i;
-int main() {
+int main(void)
+{
    pv = &i;
    // Cast optional in C required in C++
    pint = (int *)pv;