diff --git a/src/07_STD/CMakeLists.txt b/src/07_STD/CMakeLists.txt
index bdde11f..3dc8a35 100644
--- a/src/07_STD/CMakeLists.txt
+++ b/src/07_STD/CMakeLists.txt
@@ -1,2 +1,2 @@
 add_executable(07_STD_MP MP/grundgeruest.cpp MP/BinaryOctet.cpp MP/BinaryOctet.h)
-add_executable(07_STD_Testat Testat/grundgeruest.cpp)
\ No newline at end of file
+add_executable(07_STD_Testat Testat/grundgeruest.cpp Testat/BinaryOctet.h Testat/BinaryOctet.cpp)
\ No newline at end of file
diff --git a/src/07_STD/Testat/BinaryOctet.cpp b/src/07_STD/Testat/BinaryOctet.cpp
new file mode 100644
index 0000000..6701ab5
--- /dev/null
+++ b/src/07_STD/Testat/BinaryOctet.cpp
@@ -0,0 +1,147 @@
+#include <iostream>
+#include <algorithm>
+#include <math.h>
+#include "BinaryOctet.h"
+
+
+BinaryOctet::BinaryOctet(int x) {
+    for (char &bitsAsDigit : bitsAsDigits) {
+        bitsAsDigit = '0';
+    }
+
+    int remainder;
+    int temp = 0;
+    while (x != 0) {
+        remainder = x % 2;
+        x /= 2;
+        bitsAsDigits[temp] = static_cast<char>(remainder + '0');
+        temp++;
+    }
+
+    std::reverse(std::begin(bitsAsDigits), std::end(bitsAsDigits));
+
+    int ones = 0;
+    for (char c : bitsAsDigits) {
+        if (c == '1') ones++;
+    }
+
+    evenParity = ones % 2 == 0;
+}
+
+const BinaryOctet BinaryOctet::operator--(int) {
+    return operator-(*new BinaryOctet(1));
+}
+
+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) {
+        //Arbeitsvariablen anlegen und char in int umwandeln für einfachere Rechnung
+        int tmp;
+        int aI = a.bitsAsDigits[i] - '0';
+        int bI = bitsAsDigits[i] - '0';
+
+
+        if(over) tmp = aI + bI + 1;
+        else tmp = aI + bI;
+        over = false;
+
+
+        if(tmp >= 2) {
+            over = true;
+            if (tmp % 2 == 0) tmp = 0;
+            else tmp = 1;
+        }
+
+        //Umwandlung in char und ins Ergebnis schreiben
+        result.bitsAsDigits[i] = static_cast<char>(tmp + '0');
+    }
+    return result;
+}
+
+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;
+}
+
+BinaryOctet BinaryOctet::operator/(BinaryOctet &a) {
+    BinaryOctet result = *new BinaryOctet(0);
+
+    while(*this >= a) {
+        *this = *this - a;
+        result = result + BinaryOctet(1);
+    }
+    return result;
+}
+
+bool BinaryOctet::operator==(const BinaryOctet &a) {
+    if(a.evenParity != evenParity) return false;
+    for (int i = 0; i < bitsPerOctet; ++i) {
+        if(a.bitsAsDigits[i] != bitsAsDigits[i]) return false;
+    }
+    return true;
+}
+
+bool BinaryOctet::operator!=(BinaryOctet &a) {
+    if (a.evenParity !=evenParity) return true;
+    for (int i = 0; i < bitsPerOctet; ++i) {
+        if (a.bitsAsDigits[i] != bitsAsDigits[i]) return true;
+    }
+    return false;
+}
+
+bool BinaryOctet::operator>=(BinaryOctet &a) {
+
+    int power = 8;
+    int aI = 0;
+    for(int i = 0; i <= bitsPerOctet - 1; i++) {
+        power--;
+        aI = aI + (a.bitsAsDigits[i] - '0') * pow(2, power);
+    }
+
+    power = 8;
+    int bI = 0;
+    for(int i = 0; i <= bitsPerOctet - 1; i++) {
+        power--;
+        bI = bI + (bitsAsDigits[i] - '0') * pow(2, power);
+    }
+    return bI >= aI;
+}
+
+bool BinaryOctet::operator<(BinaryOctet &a) {
+
+    int power = 8;
+    int aI = 0;
+    for(int i = 0; i <= bitsPerOctet - 1; i++) {
+        power--;
+        aI = aI + (a.bitsAsDigits[i] - '0') * pow(2, power);
+    }
+
+    power = 8;
+    int bI = 0;
+    for(int i = 0; i <= bitsPerOctet - 1; i++) {
+        power--;
+        bI = bI + (bitsAsDigits[i] - '0') * pow(2, power);
+    }
+    return bI < aI;
+}
diff --git a/src/07_STD/Testat/BinaryOctet.h b/src/07_STD/Testat/BinaryOctet.h
new file mode 100644
index 0000000..8b423e6
--- /dev/null
+++ b/src/07_STD/Testat/BinaryOctet.h
@@ -0,0 +1,24 @@
+#ifndef C_C_BINARYOCTET_H
+#define C_C_BINARYOCTET_H
+
+const int bitsPerOctet = 8;
+
+struct BinaryOctet {
+    bool evenParity;
+    char bitsAsDigits[bitsPerOctet]{};
+
+
+    BinaryOctet(int x = 0);
+    BinaryOctet(const BinaryOctet&) = default;
+    const BinaryOctet operator--(int);
+    const BinaryOctet operator++(int);
+    bool operator==(const BinaryOctet &a);
+    bool operator!=(BinaryOctet &a);
+    bool operator>=(BinaryOctet &a);
+    bool operator<(BinaryOctet &a);
+    BinaryOctet operator-(BinaryOctet a);
+    BinaryOctet operator+(BinaryOctet a);
+    BinaryOctet operator/(BinaryOctet &a);
+};
+
+#endif
diff --git a/src/07_STD/Testat/grundgeruest.cpp b/src/07_STD/Testat/grundgeruest.cpp
index 64df26a..2fe11ca 100644
--- a/src/07_STD/Testat/grundgeruest.cpp
+++ b/src/07_STD/Testat/grundgeruest.cpp
@@ -2,16 +2,61 @@
 #include <cstdlib>
 #include <iostream>
 #include <ctime>
+#include <random>
+#include <vector>
+#include <algorithm>
+#include "BinaryOctet.h"
 
-struct BinaryOctet {
-  bool evenParity;
-  char bitsAsDigits[8];
-};
-
-int main()
-{
-    std::srand(std::time(0)); // use current time as seed for random generator
-    int random_variable = std::rand();
-    std::cout << "Random value on [0 " << RAND_MAX << "]: "
-              << random_variable << '\n';
+// for println();
+std::string as_string(BinaryOctet a) {
+    std::string result = "(";
+    for (char c : a.bitsAsDigits) {
+        result += c;
+    }
+    result += ")";
+    return result;
+}
+
+
+std::string as_string(BinaryOctet *a) {
+    std::string result = "(";
+    for (char c : a->bitsAsDigits) {
+        result += c;
+    }
+    result += ")";
+    return result;
+}
+
+// for std::cout
+std::ostream &operator<<(std::ostream &os, BinaryOctet toBePrinted) {
+os << as_string(toBePrinted);
+return os;
+}
+
+
+std::ostream &operator<<(std::ostream &os, BinaryOctet *toBePrinted) {
+    os << as_string(toBePrinted);
+    return os;
+}
+
+int main() {
+    std::srand(static_cast<unsigned int>(std::time(nullptr)));
+
+    std::default_random_engine generator;
+    std::uniform_int_distribution<int> distribution(0, 23);
+
+    std::vector<BinaryOctet> binVector;
+    for (int i = 0; i <= 41; i++) {
+        int rnd = distribution(generator);
+        auto bin = rnd;
+        std::cout << i << ": " << bin << std::endl;
+        auto iterator = std::find(binVector.begin(), binVector.end(), bin);
+        if(iterator == binVector.end()) {
+            binVector.emplace_back(bin);
+        }
+    }
+    std::sort(binVector.begin(), binVector.end());
+    for(BinaryOctet binaryOctet : binVector) {
+        std::cout << binaryOctet << std::endl;
+    }
 }