diff --git a/src/02_MENT/MP/main_02_MENT.cpp b/src/02_MENT/MP/main_02_MENT.cpp
index ac8a96c..0823fed 100644
--- a/src/02_MENT/MP/main_02_MENT.cpp
+++ b/src/02_MENT/MP/main_02_MENT.cpp
@@ -5,29 +5,29 @@
 
 #include "../../helpers/println.hpp"
 
-struct PascalString{
-	int length;            // number of chars used
-	char characters[256];  // chars of some character string
+struct PascalString {
+    int length;            // number of chars used
+    char characters[256];  // chars of some character string
 };
 
 char cStringArea[1024];
 
 int hexDigitToInt(char hexDigit) {
-int value = -1;
+    int value = -1;
 
-if(hexDigit > 47 && hexDigit < 58)
-    value = hexDigit - 48;
+    if (hexDigit > 47 && hexDigit < 58)
+        value = hexDigit - 48;
 
-if(hexDigit > 96 && hexDigit < 103)
-    value = hexDigit - 97 + 10;
+    if (hexDigit > 96 && hexDigit < 103)
+        value = hexDigit - 97 + 10;
 
-return value;
+    return value;
 }
 
 int hexStringToInt(PascalString binaryDigits) {
     int returnValue = 0;
 
-    for(int i = 0; i <= binaryDigits.length; ++i) {
+    for (int i = 0; i <= binaryDigits.length; ++i) {
         returnValue += binaryDigits.characters[i];
     }
 
@@ -35,7 +35,7 @@ int hexStringToInt(PascalString binaryDigits) {
 }
 
 void printPascalString(PascalString s) {
-    for(int i = 0; i <= s.length; i++) {
+    for (int i = 0; i <= s.length; i++) {
         print(s.characters[i]);
     }
     println("");
@@ -44,7 +44,7 @@ void printPascalString(PascalString s) {
 PascalString intToDual(int n) {
     int i = std::to_string(n).length() * 4;
     PascalString string = {i};
-    while(n >= 1) {
+    while (n >= 1) {
         string.characters[i] = (n % 2) + '0';
         n = n / 2;
         i--;
@@ -52,20 +52,34 @@ PascalString intToDual(int n) {
     return string;
 }
 
+PascalString intToOctal(int n) {
+    int i = std::to_string(n).length();
+    std::cout << i << " : ";
+    PascalString string = {i};
+    while (n >= 1) {
+        std::cout << n;
+        string.characters[i] = static_cast<char>((n / 8) + '0');
+        n = n / 8;
+        i--;
+    }
+    std::cout << std::endl;
+    return string;
+}
+
 char intToHexChar(int n) {
-    int returnValue = 0;
-    if(n >= 0 && n <= 9)
-        returnValue = n + '0';
-    if(n >= 10 && n <= 15)
-        returnValue = n + 97 - 10;
-        
+    char returnValue = 0;
+    if (n >= 0 && n <= 9)
+        returnValue = static_cast<char>(n + '0');
+    if (n >= 10 && n <= 15)
+        returnValue = static_cast<char>(n + 97 - 10);
+
     return returnValue;
 }
 
 PascalString intToHex(int n) {
     int i = std::to_string(n).length();
     PascalString string = {i};
-    while(n >= 1) {
+    while (n >= 1) {
         string.characters[i] = intToHexChar(n % 16);
         n = n / 16;
         i--;
@@ -75,14 +89,14 @@ PascalString intToHex(int n) {
 }
 
 int getInt(char character) {
-    if(character == '0') return 0;
+    if (character == '0') return 0;
     else return 1;
 }
 
 PascalString bitwiseDualAnd(PascalString a, PascalString b) {
     PascalString result = {b.length};
 
-    for(int i = 0; i <= b.length; ++i) {
+    for (int i = 0; i <= b.length; ++i) {
         result.characters[i] = a.characters[i] & b.characters[i];
     }
     return result;
@@ -91,19 +105,18 @@ PascalString bitwiseDualAnd(PascalString a, PascalString b) {
 PascalString bitwiseOctalAnd(PascalString a, PascalString b) {
     PascalString result = {b.length, '0'};
 
-    for(int i = 0; i <= b.length; ++i) {
+    for (int i = 0; i <= b.length; ++i) {
         result.characters[i] = a.characters[i] & b.characters[i];
     }
     return result;
 }
 
 
-
 PascalString bitwiseHexAnd(PascalString a, PascalString b) {
     a = intToDual(hexStringToInt(a));
     b = intToDual(hexStringToInt(b));
     PascalString result = bitwiseDualAnd(a, b);
-    
+
     return result;
 }
 
@@ -112,59 +125,63 @@ int to_c_string(PascalString s) {
 }
 
 void line() {
-println("===================================");
+    println("===================================");
 }
 
-int main(int argc, char** argv, char** envp) {
-    
-  PascalString s = {3, '1', '0', '0'};
-  PascalString s2 = {4, 'f', 'f', 'f', 'f'};
-  println(hexStringToInt(s));
-  line();
-  println(hexStringToInt(s2));
-  line();
-  println(hexDigitToInt('d'));
-  line();
-  println(hexDigitToInt('9'));
-  line();
-  println(hexDigitToInt('2'));
+int main(int argc, char **argv, char **envp) {
 
-  printPascalString(s2);
-  line();
+    PascalString s = {3, '1', '0', '0'};
+    PascalString s2 = {4, 'f', 'f', 'f', 'f'};
+    println(hexStringToInt(s));
+    line();
+    println(hexStringToInt(s2));
+    line();
+    println(hexDigitToInt('d'));
+    line();
+    println(hexDigitToInt('9'));
+    line();
+    println(hexDigitToInt('2'));
 
-  int controlRegister = 128;
-  controlRegister |= 64+32;
-  controlRegister ^=16;
-  controlRegister &= 128+64;
-  controlRegister <<= 1;
+    printPascalString(s2);
+    line();
 
-  println(controlRegister);
-  line();
-  std::cout << "intToHexChar = " << intToHexChar(6) << std::endl;
-  line();
-  println(intToHexChar(10));
-  line();
-  printPascalString(intToDual(4106));
-  line();
-  printPascalString(intToHex(965));
-  line();
-  printPascalString(intToHex(1956));
+    int controlRegister = 128;
+    controlRegister |= 64 + 32;
+    controlRegister ^= 16;
+    controlRegister &= 128 + 64;
+    controlRegister <<= 1;
 
-  line();
-  printPascalString(bitwiseDualAnd({3, '1', '1', '0'}, {3, '1', '1', '1'}));
-  line();
-  printPascalString(bitwiseDualAnd({3, '1', '1', '1'}, {3, '1', '1', '1'}));
-  line();
-  printPascalString(bitwiseDualAnd({3, '0', '1', '0'}, {3, '1', '0', '1'}));
-  line();
-  printPascalString(bitwiseDualAnd({3, '1', '0', '0'}, {3, '1', '1', '1'}));
-  line();
-  printPascalString(bitwiseOctalAnd({2, '6', '3'}, {2, '1', '2'}));
-  
-  
-  line();
-  printPascalString(bitwiseHexAnd({2, 'A', '1'}, {2, 'C', '2'}));
+    println(controlRegister);
+    line();
+    std::cout << "intToHexChar = " << intToHexChar(6) << std::endl;
+    line();
+    println(intToHexChar(10));
+    line();
+    printPascalString(intToDual(4106));
+    line();
+    printPascalString(intToHex(965));
+    line();
+    printPascalString(intToHex(1956));
 
-  return 0;
+    line();
+    std::cout << "intToOctal = ";
+    printPascalString(intToOctal(32));
+
+    line();
+    printPascalString(bitwiseDualAnd({3, '1', '1', '0'}, {3, '1', '1', '1'}));
+    line();
+    printPascalString(bitwiseDualAnd({3, '1', '1', '1'}, {3, '1', '1', '1'}));
+    line();
+    printPascalString(bitwiseDualAnd({3, '0', '1', '0'}, {3, '1', '0', '1'}));
+    line();
+    printPascalString(bitwiseDualAnd({3, '1', '0', '0'}, {3, '1', '1', '1'}));
+    line();
+    printPascalString(bitwiseOctalAnd({2, '6', '3'}, {2, '1', '2'}));
+
+
+    line();
+    printPascalString(bitwiseHexAnd({2, 'A', '1'}, {2, 'C', '2'}));
+
+    return 0;
 }
 
diff --git a/src/04_UDEF/MP/main_04_UDEF_e.cpp b/src/04_UDEF/MP/main_04_UDEF_e.cpp
index ff430f5..3dc4a47 100644
--- a/src/04_UDEF/MP/main_04_UDEF_e.cpp
+++ b/src/04_UDEF/MP/main_04_UDEF_e.cpp
@@ -1,5 +1,6 @@
 #include <iostream>
 #include <algorithm>
+#include <math.h>
 
 const int bitsPerOctet = 8;
 
@@ -104,7 +105,6 @@ BinaryOctet BinaryOctet::operator/(BinaryOctet &a) {
     while(*this >= a) {
         *this = *this - a;
         result = result + 1;
-        std::cout << result.bitsAsDigits << std::endl;
     }
     return result;
 }
@@ -120,16 +120,19 @@ bool BinaryOctet::operator!=(BinaryOctet &a) {
 
 //TODO: this
 bool BinaryOctet::operator>=(BinaryOctet &a) {
-    if(!operator!=(a)) return true;
 
+    int power = 8;
     int aI = 0;
-    for(int i = bitsPerOctet - 1; i >= 0; --i) {
-        aI =+ (a.bitsAsDigits[i] - '0') * 2 ^ i;
+    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 = bitsPerOctet - 1; i >= 0; --i) {
-        bI += (bitsAsDigits[i] - '0') * 2 ^ i;
+    for(int i = 0; i <= bitsPerOctet - 1; i++) {
+        power--;
+        bI = bI + (bitsAsDigits[i] - '0') * pow(2, power);
     }
     return bI >= aI;
 }
@@ -144,6 +147,16 @@ BinaryOctet doCalculation(BinaryOctet a, BinaryOctet b) {
     return result;
 }
 
+int doCalculation(int a, int b) {
+    int result;
+    for (; a != b; b--) {
+        a = a + 1;
+        a = a / b;
+    }
+    result = a + b;
+    return result;
+}
+
 
 // for println();
 std::string as_string(BinaryOctet a) {
@@ -194,6 +207,10 @@ int main(int argc, char **argv) {
     std::cout << "=========   operator-   ==========" << std::endl;
     std::cout << "a - b = " << a - b << std::endl;
 
+    std::cout << "=========   operator>=   ==========" << std::endl;
+    bool isGreater = a >= b;
+    std::cout << "a >= b = " << isGreater << std::endl;
+
     std::cout << "=========   operator/   ==========" << std::endl;
     std::cout << "a / b = " << a / b << std::endl;
 
@@ -205,5 +222,6 @@ int main(int argc, char **argv) {
 
     std::cout << "==============   doCalculation   ================" << std::endl;
     std::cout << "result = " << doCalculation(a, b) << std::endl;
+    //std::cout << "result = " << doCalculation(0b00001111, 0b00000110) << std::endl;
     return 0;
 }
\ No newline at end of file
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 8cb46e6..eaf329a 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -9,7 +9,9 @@ add_executable(03_FLOW_MP 03_FLOW/MP/main_mp2_FLOW_a.cpp helpers/AnsiConsole.cpp
 add_executable(03_FLOW_Testat 03_FLOW/Testat/main_mp2_FLOW_a.cpp helpers/AnsiConsole.cpp)
 
 add_executable(04_UDEF_MP 04_UDEF/MP/main_04_UDEF_e.cpp)
+target_link_libraries(04_UDEF_MP m)
 add_executable(04_UDEF_Testat 04_UDEF/Testat/Testat.cpp)
+target_link_libraries(04_UDEF_Testat m)
 
 add_executable(05_OO_MP 05_OO/MP/shapes_main.cpp helpers/AnsiConsole.cpp)
 add_executable(05_OO_Testat 05_OO/Testat/shapes_main.cpp helpers/AnsiConsole.cpp)