diff --git a/ComplexNumber/ComplexNumber.cpp b/ComplexNumber/ComplexNumber.cpp
new file mode 100644
index 0000000..544ee3f
--- /dev/null
+++ b/ComplexNumber/ComplexNumber.cpp
@@ -0,0 +1,31 @@
+#ifndef COMPLEX_CPP
+#define COMPLEX_CPP
+
+#include "ComplexNumber.h"
+#include <iostream>
+
+Complex::Complex(double real, double imaginary) {
+    this->real = real;
+    this->imaginary = imaginary;
+}
+
+double Complex::getReal() const {
+    return real;
+}
+
+double Complex::getImaginary() const {
+    return imaginary;
+}
+
+Complex Complex::operator+(const Complex& other) const {
+    double resultReal = real + other.real;
+    double resultImaginary = imaginary + other.imaginary;
+    return Complex(resultReal, resultImaginary);
+}
+
+std::ostream& operator<<(std::ostream& os, const Complex& complex) {
+    os << complex.getReal() << "+" << complex.getImaginary() << "i";
+    return os;
+}
+
+#endif
diff --git a/ComplexNumber/ComplexNumber.h b/ComplexNumber/ComplexNumber.h
new file mode 100644
index 0000000..a03394c
--- /dev/null
+++ b/ComplexNumber/ComplexNumber.h
@@ -0,0 +1,17 @@
+#ifndef COMPLEX_H
+#define COMPLEX_H
+
+class Complex 
+{
+    private:
+        double real;
+        double imaginary;
+
+    public:
+        Complex(double real, double imaginary);
+        double getReal() const;
+        double getImaginary() const;
+        Complex operator+(const Complex& other) const;
+};
+
+#endif
diff --git a/ComplexNumber/main.cpp b/ComplexNumber/main.cpp
new file mode 100644
index 0000000..6ff15ec
--- /dev/null
+++ b/ComplexNumber/main.cpp
@@ -0,0 +1,13 @@
+#include <iostream>
+#include "ComplexNumber.cpp"
+
+
+int main()
+{
+    Complex C1(2.0,4.0);
+    Complex C2(1.0,3.0);
+
+    std::cout << C1 << "+" << C2 << "=" << C1 + C2;
+
+    return 0;
+}
\ No newline at end of file
diff --git a/TestMessage/Message.h b/TestMessage/Message.h
index 47186c2..a136ba9 100644
--- a/TestMessage/Message.h
+++ b/TestMessage/Message.h
@@ -8,9 +8,10 @@ class Message
         std::string message;
 
 
-
     public:
-        Message(std::string);
+        Message();
+        Message(std::string);   //Konstruktor with specific parameter
+        Message(Message&);      //& für die Referenz, copy constructor
 
         void printMessage();
         void setMessage(std::string);
diff --git a/TestMessage/TestMessage.cpp b/TestMessage/TestMessage.cpp
index 1b20b3d..176a37a 100644
--- a/TestMessage/TestMessage.cpp
+++ b/TestMessage/TestMessage.cpp
@@ -7,4 +7,4 @@ int main()
     myMessage.setMessage("Schluss fuer heute!");
     myMessage.printMessage();
     return 0;
-};
\ No newline at end of file
+};