diff --git a/04_UDEF/MP/main_04_UDEF_e.cpp b/04_UDEF/MP/main_04_UDEF_e.cpp
index ad43ea3..daef257 100644
--- a/04_UDEF/MP/main_04_UDEF_e.cpp
+++ b/04_UDEF/MP/main_04_UDEF_e.cpp
@@ -1,6 +1,6 @@
 // file main_04_UDEF_e.cpp
-#include "../../helpers/println.hpp"
 #include <iostream>
+#include <algorithm>
 
 const int bitsPerOctet = 8;
 
@@ -8,35 +8,42 @@ struct BinaryOctet {
 public:
     bool evenParity;   // set to true if number of '1' in bitsAsDigits is even, false otherwise
     char bitsAsDigits[bitsPerOctet]{}; // bit values as chars
-    BinaryOctet(int x = 0);
+    BinaryOctet();
+    BinaryOctet(int x);
     BinaryOctet(const BinaryOctet &) = default;
-    BinaryOctet& operator=(int const &a);
+    BinaryOctet &operator=(int const &a);
     const BinaryOctet operator--(int);
 };
 
-BinaryOctet::BinaryOctet(int x) {
-    //Alles mit 0 füllen
+BinaryOctet::BinaryOctet() {
     for (char &bitsAsDigit : bitsAsDigits) {
         bitsAsDigit = '0';
     }
-    int length = static_cast<int>(std::to_string(x).length() * 4);
-    while (length >= 0) {
-        bitsAsDigits[length-1] = (x % 2 == 0) ? '0' : '1';
-        std::cout << x << " : " << length << " : " << bitsAsDigits[length-1] << std::endl;
-        x = x / 2;
-        length--;
+    evenParity = true;
+}
+
+BinaryOctet::BinaryOctet(int x) {
+        for (int i = 0; i <= bitsPerOctet - 1; i++) {
+        int tmp = ((x >> i) & 1);
+        bitsAsDigits[i] = (tmp == 1) ? '1' : '0';
     }
+    //TODO: das sollte eigentlich nicht benötigt werden
+    std::reverse(std::begin(bitsAsDigits), std::end(bitsAsDigits));
+
+    //einsen zählen
     int i = 0;
     for (char c : bitsAsDigits) {
         if (c == '1') i++;
     }
+
     evenParity = i % 2 == 0;
 }
 
+
 bool operator!=(BinaryOctet a, BinaryOctet b) {
-    if(a.evenParity != b.evenParity) return false;
+    if (a.evenParity != b.evenParity) return false;
     for (int i = 0; i < bitsPerOctet; ++i) {
-        if(a.bitsAsDigits[i] != b.bitsAsDigits[i]) return false;
+        if (a.bitsAsDigits[i] != b.bitsAsDigits[i]) return false;
     }
     return true;
 }
@@ -51,7 +58,7 @@ BinaryOctet operator+(BinaryOctet a, BinaryOctet b) {
     BinaryOctet result;
 
     for (int i = 0; i < bitsPerOctet; ++i) {
-        if(a.bitsAsDigits[i] == b.bitsAsDigits[i]) result.bitsAsDigits[i] = '0';
+        if (a.bitsAsDigits[i] == b.bitsAsDigits[i]) result.bitsAsDigits[i] = '0';
         else result.bitsAsDigits[i] = '1';
     }
 
@@ -67,10 +74,9 @@ BinaryOctet operator/(BinaryOctet a, BinaryOctet b) {
     return a;
 }
 
-BinaryOctet& BinaryOctet::operator=(int const &a) {
-    std::cout << a << std::endl;
-    std::string tmp = to_string(a);
-    for(int i = 0; i < bitsPerOctet; i++) {
+BinaryOctet &BinaryOctet::operator=(int const &a) {
+    std::string tmp = std::to_string(a);
+    for (int i = 0; i >= tmp.length(); i++) {
         bitsAsDigits[i] = tmp[i];
     }
     return *this;
@@ -98,9 +104,9 @@ std::string as_string(BinaryOctet a) {
 }
 
 // for std::cout
-std::ostream& operator<< (std::ostream& os, const BinaryOctet &toBePrinted){
-	os << as_string(toBePrinted);
-	return os;
+std::ostream &operator<<(std::ostream &os, const BinaryOctet &toBePrinted) {
+    os << as_string(toBePrinted);
+    return os;
 }
 
 int main(int argc, char **argv) {
@@ -109,9 +115,8 @@ int main(int argc, char **argv) {
     BinaryOctet b = 0b00000110;
     std::cout << b << std::endl;
     std::cout << new BinaryOctet(5) << std::endl;
-    println(a + b);
     std::cout << a + b << std::endl;
     //println("result = ", doCalculation(a,b));
-    std::cout << "result = " << doCalculation(a,b) << std::endl;
+    std::cout << "result = " << doCalculation(a, b) << std::endl;
     return 0;
 }
diff --git a/07_STD/MP/grundgeruest.cpp b/07_STD/MP/grundgeruest.cpp
index f242ce5..2b853fc 100644
--- a/07_STD/MP/grundgeruest.cpp
+++ b/07_STD/MP/grundgeruest.cpp
@@ -24,7 +24,8 @@ int main() {
     std::uniform_int_distribution<int> distribution(0, 23);
 
     for(int i = 0; i <= 41; i++) {
-        array[i] = distribution(generator);
+        int rnd = distribution(generator);
+        array[i] = rnd;
     }
 
     unittest_stringSimilarity();
diff --git a/11_PUTT/Test.cpp b/11_PUTT/Test.cpp
index b25351d..cde3791 100644
--- a/11_PUTT/Test.cpp
+++ b/11_PUTT/Test.cpp
@@ -7,7 +7,7 @@
 int main() {
     Derived * derived = new Derived();
 
-    bar(derived);
+    foo(derived);
 
     delete derived;
 
diff --git a/11_PUTT/Test.h b/11_PUTT/Test.h
index 5020256..4579a96 100644
--- a/11_PUTT/Test.h
+++ b/11_PUTT/Test.h
@@ -10,7 +10,7 @@ class Base {
 
 };
 
-class Derived : Base {
+class Derived : public Base {
 };
 
 void foo(Base* base) {