diff --git a/Calculator_Update/calculator.h b/Calculator_Update/calculator.h
new file mode 100644
index 0000000000000000000000000000000000000000..1c210db604918aecd4a936bd0317863b6825c032
--- /dev/null
+++ b/Calculator_Update/calculator.h
@@ -0,0 +1,76 @@
+#ifndef CALCULATOR_H
+#define CALCULATOR_H
+#include "sinus.h"
+#include <iostream>
+
+#include <QMainWindow>
+#include <string>
+#include <vector>
+
+QT_BEGIN_NAMESPACE
+namespace Ui {
+class Calculator;
+}
+QT_END_NAMESPACE
+
+class Calculator : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    Calculator(QWidget *parent = nullptr); //default
+    ~Calculator(); //default
+    //int& index is a reference to an integer and QString& str is a reference to a QString object
+        //the functions ausdruck, summand, factor, and zahl are all parsing the 'str' string character by character.
+    //'references' are used in these function parameters to allow multiple functions to operate on the same data
+
+    //QString is a class from the Qt framework which is used for manipulating Unicode strings,
+    //more efficient and internationalized applications friendly, better as normal std::string
+    double ausdruck(char& zeichen); //Das eingelesene Zeichen wird immer
+    double summand(char& zeichen); //per Referenz übergeben, damit es
+    double factor(char& zeichen); //weitergereicht werden kann, wenn eine
+    double zahl(char& zeichen); //Funktion es nicht verarbeiten kann.
+    void check(char& zeichen);
+    void ausgabe();
+    char getZeichen();
+    double calcSin(double result, Sinus::Modus defaultModus);
+    std::string input="";
+
+private slots:
+    void char1();
+    void char2();
+    void char3();
+    void char4();
+    void char5();
+    void char6();
+    void char7();
+    void char8();
+    void char9();
+    void char0();
+    void charDiv();
+    void charSum();
+    void charSub();
+    void charFac();
+    void charFloat();
+    void charKlammerAuf();
+    void charKlammerZu();
+    void berechne();
+    void clearText();
+    void onSinButtonClicked();
+    void onGradButtonClicked();
+    void onRadButtonClicked();
+    void onGonButtonClicked();
+    void onPiButtonClicked();
+    void charKlammerEckig();
+
+
+
+private:
+    Ui::Calculator *ui; //default
+    bool isSinus =  false;
+    double pi = 3.14159265;
+    std::vector <std::string> ausdruecke;
+    Sinus sinus;
+};
+
+#endif // CALCULATOR_H