add intro c++

CPlusPlus/intro/functions.cpp

@@ -0,0 +1,34 @@
+#include "functions.h"
+#include <iostream>
+
+void functionF() {}
+
+void printArray(int numbers[], size_t count)
+{
+	for (size_t i = 0; i < count; i++)
+	{
+		std::cout << numbers[i] << " ";
+	}
+	std::cout << std::endl;
+}
+
+void changeInt(int n)
+{
+	std::cout << "addr of n: " << &n << std::endl;
+	n *= 10;
+}
+
+void changeIntPointer(int* pN)
+{
+	if (pN == nullptr) return;
+
+	std::cout << "addr of pN: " << &pN << std::endl;
+	std::cout << "pN: " << pN << std::endl;
+	*pN *= 10;
+}
+
+void changeIntReference(int& n)
+{
+	std::cout << "addr of n: " << &n << std::endl;
+	n *= 10;
+}