add forward declaration

add classes

CPlusPlus/Intro/main.cpp

@@ -4,6 +4,7 @@ using namespace std;
 
 int main()
 {
+	// console output
 	std::cout << "Hello World" << std::endl;
 	std::cout << 1234 << std::endl;
 	std::cout << "Another test!\n";
@@ -15,5 +16,16 @@ int main()
 
 	cout << L"Hello World" << endl; // wide character string literal, can not be handled by cout
 
+	// console input
+	cin >> number;
+	cout << "input: " << number << endl;
+
+	char c;
+	cin >> c;
+	cout << "input: " << c << endl;
+
+	cin >> c >> number;
+	cout << c << ": " << number << endl;
+
 	return 0;
 }