diff --git a/calculator.cpp b/calculator.cpp
new file mode 100644
index 0000000..fe7cfe2
--- /dev/null
+++ b/calculator.cpp
@@ -0,0 +1,51 @@
+#include <iostream>
+
+using namespace std;
+
+int number(int current) {
+    cout << "+ - * oder :?";
+
+    string input;
+    cin >> input;
+
+    cout << "Was möchtest du berechnen?";
+    int num2;
+
+    cin >> num2;
+
+    if(input == "+") {
+        return current + num2;
+    } else if(input == "-") {
+        return current - num2;
+    } else if(input == "*") {
+        return current * num2;
+    } else if(input == ":") {
+        return current / num2;
+    }
+
+}
+
+int main() {
+    cout << "Was ist die Startzahl?";
+
+    int start;
+    cin >> start;
+
+    bool finished = false;
+
+    while (!finished) {
+        start = number(start);
+
+        cout << "Möchtest du weiter machen?";
+        string input;
+        cin >> input;
+
+        if (input == "nein" || input == "Nein") {
+            finished = true;
+        }
+    }
+
+    cout << "Dein Ergebnis: " << start;
+
+    return 0;
+}
\ No newline at end of file