diff --git a/src/02_MENT/Testat/main_02_MENT.cpp b/src/02_MENT/Testat/main_02_MENT.cpp
index 5f033a5..cc3047b 100644
--- a/src/02_MENT/Testat/main_02_MENT.cpp
+++ b/src/02_MENT/Testat/main_02_MENT.cpp
@@ -8,31 +8,52 @@ struct PascalString{
 	char characters[256];  // chars of some character string
 };
 
-int hexDigitToInt(char hexDigit) {
-int value = -1;
-
-if(hexDigit > 47 && hexDigit < 58)
-    value = hexDigit - 48;
-
-if(hexDigit > 96 && hexDigit < 103)
-    value = hexDigit - 97 + 10;
-
-return value;
+void printPascalString(PascalString string) {
+    for(char c : string.characters)
+        print(c);
+    println("");
 }
 
-int hexStringToInt(PascalString binaryDigits) {
-    int returnValue = 0;
+int lengthOfInt(int i) {
+    if(i < 8) return 1;
+    return 1 + lengthOfInt(i / 8);
+}
 
-    for(int i = 0; i < binaryDigits.length; i++) {
-        int x = hexDigitToInt(binaryDigits.characters[i]);
-        std::cout << "i = " << i << " x = " << x << std::endl;
-        returnValue += x;
+
+PascalString intToOctal(int value) {
+    int i = lengthOfInt(value) + 1;
+    PascalString result = {i};
+    while(i > 1) {
+        result.characters[i] = (value % 8) + '0';
+        value = value / 8;
+        i--;
     }
+    return result;
     
-    return returnValue;
+}
+
+PascalString bitwiseDualAnd(PascalString a, PascalString b) {
+    PascalString result = {a.length};
+    println(result.length);
+    for(int i = a.length; i >= 0; --i) {
+        int ac = a.characters[i] - '0';
+        int bc = b.characters[i] - '0';
+        result.characters[i] = (ac & bc) + '0';
+    }
+    return result;
 }
 
 int main(int argc, char** argv, char** envp) {
-    std::cout << hexStringToInt({3, '2', 'f', '1'}) << std::endl;
+    println("=============printPascalString===============");
+    printPascalString({3, '3', 'f', '1'});
+    printPascalString({5, 'H', 'a', 'l', 'l', 'o'});
+    println("=============intToOctal===============");
+    printPascalString(intToOctal(7));
+    printPascalString(intToOctal(565));
+    printPascalString(intToOctal(585858));
+    println("=============bitwiseDualAnd===============");
+    printPascalString(bitwiseDualAnd({2, '0', '1'}, {2, '1', '0'}));
+    printPascalString(bitwiseDualAnd({2, '1', '1'}, {2, '1', '1'}));
+    printPascalString(bitwiseDualAnd({7, '1', '0', '1', '0', '1', '0', '1'}, {7, '0', '0', '1', '1', '0', '0', '1'}));
   return 0;
 }