add classes

classes/hund.cpp

@@ -0,0 +1,12 @@
+// #include "tier.cpp"
+
+class hund : public tier
+{
+    public:
+        hund();
+};
+
+hund::hund() : tier()
+{
+    Laut =  "wuff";
+}

classes/katze.cpp

@@ -0,0 +1,12 @@
+// #include "tier.cpp"
+
+class katze : public tier
+{
+    public:
+        katze();
+};
+
+katze::katze() : tier()
+{
+    Laut =  "miau";
+}

classes/main.cpp

@@ -0,0 +1,13 @@
+#include "tier.cpp"
+#include "hund.cpp"
+#include "katze.cpp"
+#include <stdio.h>
+#include <iostream>
+#include <string>
+
+int main(){
+    katze a;
+    std::string laut = a.getLaut();
+    std::cout << laut << std::endl; 
+    return 0;
+}

classes/makefile

@@ -0,0 +1,5 @@
+dev: compile run
+compile:
+	g++ -o program main.cpp
+run: 
+	./program	

classes/tier.cpp

@@ -0,0 +1,22 @@
+#include<stdio.h>
+#include <string>
+
+class tier{
+    public:
+        tier();
+
+        std::string getLaut();
+    protected:
+        std::string Laut;
+};
+
+tier::tier() {
+this->Laut = "void";
+
+}    
+
+std::string tier::getLaut()
+{
+
+    return this->Laut;
+}

fibonacci/#main.cpp#

@@ -0,0 +1,6 @@
+#include<iostream>
+
+int fib(int n)
+{
+    return n < 2 ? 1 : fib(n-2)+ fib(n-1);
+}