add pointer

add smart pointer

CPlusPlus/Pointer/functions.cpp

@@ -0,0 +1,18 @@
+#include "functions.h"
+
+void changeInteger(int n)
+{
+	n *= 2;
+}
+
+void changeIntegerPerPointer(int* pN)
+{
+	if (pN == nullptr) return; // BE CAREFUL - a pointer can always be nullptr
+
+	*pN *= 2;
+}
+
+void changeIntegerPerReference(int& n)
+{
+	n *= 2;
+}