diff --git a/04_UDEF/MP/main_04_UDEF_e.cpp b/04_UDEF/MP/main_04_UDEF_e.cpp
index a9afe15..ff430f5 100644
--- a/04_UDEF/MP/main_04_UDEF_e.cpp
+++ b/04_UDEF/MP/main_04_UDEF_e.cpp
@@ -6,11 +6,14 @@ const int bitsPerOctet = 8;
 struct BinaryOctet {
     bool evenParity;
     char bitsAsDigits[bitsPerOctet]{};
+
     BinaryOctet(int x = 0);
     BinaryOctet(const BinaryOctet&) = default;
-    BinaryOctet &operator=(int &a);
-    BinaryOctet operator--(int);
-    BinaryOctet operator-(BinaryOctet &a);
+    const BinaryOctet operator--(int);
+    const BinaryOctet operator++(int);
+    bool operator!=(BinaryOctet &a);
+    bool operator>=(BinaryOctet &a);
+    BinaryOctet operator-(BinaryOctet a);
     BinaryOctet operator+(BinaryOctet a);
     BinaryOctet operator/(BinaryOctet &a);
 };
@@ -19,54 +22,32 @@ BinaryOctet::BinaryOctet(int x) {
     for (char &bitsAsDigit : bitsAsDigits) {
         bitsAsDigit = '0';
     }
-    for (int i = 0; i <= bitsPerOctet - 1; i++) {
-        int tmp = ((x >> i) & 1);
-        bitsAsDigits[i] = (tmp == 1) ? '1' : '0';
+
+    int remainder;
+    int temp = 0;
+    while (x != 0) {
+        remainder = x % 2;
+        x /= 2;
+        bitsAsDigits[temp] = static_cast<char>(remainder + '0');
+        temp++;
     }
-    //FIXME: das sollte eigentlich nicht benötigt werden
+
     std::reverse(std::begin(bitsAsDigits), std::end(bitsAsDigits));
 
-    //einsen zählen
-    int i = 0;
+    int ones = 0;
     for (char c : bitsAsDigits) {
-        if (c == '1') i++;
+        if (c == '1') ones++;
     }
 
-    evenParity = i % 2 == 0;
-    //std::cout << evenParity << std::endl;
+    evenParity = ones % 2 == 0;
 }
 
-BinaryOctet &BinaryOctet::operator=(int &a) {
-    std::string tmp = std::to_string(a);
-    for (int i = 0; i >= tmp.length(); i++) {
-        bitsAsDigits[i] = tmp[i];
-    }
-    return *this;
-}
-
-BinaryOctet BinaryOctet::operator--(int) {
+const BinaryOctet BinaryOctet::operator--(int) {
     return operator-(*new BinaryOctet(1));
 }
 
-BinaryOctet BinaryOctet::operator-(BinaryOctet &a) {
-    BinaryOctet result;
-    bool over = false;
-    for(int i = bitsPerOctet - 1; i >= 0; --i) {
-        int tmp;
-        int aI = a.bitsAsDigits[i] - '0';
-        int bI = bitsAsDigits[i] - '0';
-
-        if(over) tmp = bI - aI - 1;
-        else tmp = bI - aI;
-        over = false;
-
-        if(tmp < 0) {
-            over = true;
-            tmp = tmp + 1;
-        }
-        result.bitsAsDigits[i] = static_cast<char>(tmp + '0');
-    }
-    return result;
+const BinaryOctet BinaryOctet::operator++(int) {
+    return operator+(*new BinaryOctet(1));
 }
 
 BinaryOctet BinaryOctet::operator+(BinaryOctet a) {
@@ -96,22 +77,63 @@ BinaryOctet BinaryOctet::operator+(BinaryOctet a) {
     return result;
 }
 
-BinaryOctet BinaryOctet::operator/(BinaryOctet &a) {
+BinaryOctet BinaryOctet::operator-(BinaryOctet a) {
     BinaryOctet result;
+    bool over = false;
+    for(int i = bitsPerOctet - 1; i >= 0; --i) {
+        int tmp;
+        int aI = a.bitsAsDigits[i] - '0';
+        int bI = bitsAsDigits[i] - '0';
 
+        if(over) tmp = bI - aI - 1;
+        else tmp = bI - aI;
+        over = false;
 
-
+        if(tmp < 0) {
+            over = true;
+            tmp = tmp + 1;
+        }
+        result.bitsAsDigits[i] = static_cast<char>(tmp + '0');
+    }
     return result;
 }
 
-bool operator!=(BinaryOctet a, BinaryOctet b) {
-    if (a.evenParity != b.evenParity) return false;
+BinaryOctet BinaryOctet::operator/(BinaryOctet &a) {
+    BinaryOctet result = *new BinaryOctet(0);
+
+    while(*this >= a) {
+        *this = *this - a;
+        result = result + 1;
+        std::cout << result.bitsAsDigits << std::endl;
+    }
+    return result;
+}
+
+bool BinaryOctet::operator!=(BinaryOctet &a) {
+    if (a.evenParity !=evenParity) return false;
     for (int i = 0; i < bitsPerOctet; ++i) {
-        if (a.bitsAsDigits[i] != b.bitsAsDigits[i]) return false;
+        if (a.bitsAsDigits[i] != bitsAsDigits[i]) return false;
     }
     return true;
 }
 
+
+//TODO: this
+bool BinaryOctet::operator>=(BinaryOctet &a) {
+    if(!operator!=(a)) return true;
+
+    int aI = 0;
+    for(int i = bitsPerOctet - 1; i >= 0; --i) {
+        aI =+ (a.bitsAsDigits[i] - '0') * 2 ^ i;
+    }
+
+    int bI = 0;
+    for(int i = bitsPerOctet - 1; i >= 0; --i) {
+        bI += (bitsAsDigits[i] - '0') * 2 ^ i;
+    }
+    return bI >= aI;
+}
+
 BinaryOctet doCalculation(BinaryOctet a, BinaryOctet b) {
     BinaryOctet result;
     for (; a != b; b--) {
@@ -172,11 +194,14 @@ int main(int argc, char **argv) {
     std::cout << "=========   operator-   ==========" << std::endl;
     std::cout << "a - b = " << a - b << std::endl;
 
+    std::cout << "=========   operator/   ==========" << std::endl;
+    std::cout << "a / b = " << a / b << std::endl;
+
 
     std::cout << "========   operator--   ============" << std::endl;
     BinaryOctet d = 0b111111111;
     d--;
-    std::cout << d-- << std::endl;
+    std::cout << "11111111-- = " << d-- << std::endl;
 
     std::cout << "==============   doCalculation   ================" << std::endl;
     std::cout << "result = " << doCalculation(a, b) << std::endl;