diff --git a/Задание 3.cpp b/Задание 3.cpp
new file mode 100644
index 0000000..cccf397
--- /dev/null
+++ b/Задание 3.cpp	
@@ -0,0 +1,59 @@
+#include <iostream>
+#include <iomanip>
+#include <cstddef>
+#include <cstring>
+
+struct Student {
+    char name[17];
+    uint16_t year;
+    float gpa;
+    unsigned gender : 1;
+    uint8_t courses;
+    Student* leader;
+};
+
+void printStudentInfo(const Student &student) {
+    std::cout << "���: " << student.name << std::endl;
+    std::cout << "��� �����������: " << student.year << std::endl;
+    std::cout << "������� ����: " << student.gpa << std::endl;
+    std::cout << "���: " << (student.gender ? "�������" : "�������") << std::endl;
+    std::cout << "���������� ���������� ������: " << static_cast<int>(student.courses) << std::endl;
+    std::cout << "��������� �� ��������: " << student.leader << std::endl;
+}
+
+void printMemoryLayout(const Student &student) {
+    std::cout << "����� ���������: " << &student << std::endl;
+    std::cout << "�������� �����: " << offsetof(Student, name) << ", ������: " << sizeof(student.name) << std::endl;
+    std::cout << "�������� ���� �����������: " << offsetof(Student, year) << ", ������: " << sizeof(student.year) << std::endl;
+    std::cout << "�������� �������� �����: " << offsetof(Student, gpa) << ", ������: " << sizeof(student.gpa) << std::endl;
+    // ������� ������� ������������� offsetof ��� gender
+    // std::cout << "�������� ����: " << offsetof(Student, gender) << ", ������: 1 ���" << std::endl;
+    std::cout << "���: �������� 1 ��� (���������� ������� �� ��������� ��� offset-of)" << std::endl;
+    std::cout << "�������� ������: " << offsetof(Student, courses) << ", ������: " << sizeof(student.courses) << std::endl;
+    std::cout << "�������� ��������� �� ��������: " << offsetof(Student, leader) << ", ������: " << sizeof(student.leader) << std::endl;
+
+    std::cout << "����������������� ������������� ����������� ���������: ";
+    const unsigned char* bytes = reinterpret_cast<const unsigned char*>(&student);
+    for (size_t i = 0; i < sizeof(Student); ++i) {
+        std::cout << std::hex << std::setw(2) << std::setfill('0') << static_cast<int>(bytes[i]) << " ";
+    }
+    std::cout << std::dec << std::endl;
+}
+
+int main() {
+    Student student1 = {"Alice", 2021, 3.8, 0, 5, nullptr};
+    Student student2 = {"Bob", 2021, 3.5, 1, 6, &student1};
+    Student starosta = {"Charlie", 2020, 4.0, 1, 8, nullptr};
+
+    Student students[] = {student1, student2, starosta};
+
+    std::cout << "����� �������: " << &students << ", ������: " << sizeof(students) << std::endl;
+
+    for (size_t i = 0; i < 3; ++i) {
+        std::cout << "\n--- ������� " << i + 1 << " ---" << std::endl;
+        printStudentInfo(students[i]);
+        printMemoryLayout(students[i]);
+    }
+
+    return 0;
+}
diff --git a/Задание 4.cpp b/Задание 4.cpp
new file mode 100644
index 0000000..903f377
--- /dev/null
+++ b/Задание 4.cpp	
@@ -0,0 +1,72 @@
+#include <iostream>
+#include <fstream>
+#include <cstring>
+#include <cctype>
+
+bool isValidFilename(const char* filename) {
+    const char* invalidChars = "*\"<>?|";
+    if (strpbrk(filename, invalidChars)) return false;
+
+    char* colon = strchr(filename, ':');
+    if (colon) {
+        if (colon != filename + 1 || !isalpha(filename[0]) || colon[1] != '\\') return false;
+    }
+
+    const char* extension = strrchr(filename, '.');
+    if (extension) {
+        char ext[5];
+        strncpy(ext, extension, 4);
+        ext[4] = '\0';
+        for (char& c : ext) c = tolower(c);
+        if (strncmp(ext, ".txt", 4) != 0) return false;
+    }
+    return true;
+}
+
+int main() {
+    char filename[256];
+    std::cout << "������� ��� �����: ";
+    std::cin.getline(filename, 256);
+
+    if (!isValidFilename(filename)) {
+        std::cerr << "������������ ��� �����." << std::endl;
+        return 1;
+    }
+
+    if (!strrchr(filename, '.')) {
+        strcat(filename, ".txt");
+    }
+
+    std::ifstream file(filename, std::ios::binary);
+    if (!file) {
+        std::cerr << "������ �������� �����." << std::endl;
+        return 1;
+    }
+
+    file.seekg(0, std::ios::end);
+    std::streamsize fileSize = file.tellg();
+    file.seekg(0, std::ios::beg);
+
+    char* buffer = new char[fileSize + 1];
+    file.read(buffer, fileSize);
+    buffer[fileSize] = '\0';
+    file.close();
+
+    char searchString[256];
+    std::cout << "������� ������ ��� ������: ";
+    std::cin.getline(searchString, 256);
+
+    size_t searchLength = strlen(searchString);
+    size_t count = 0;
+    char* position = buffer;
+
+    while ((position = strstr(position, searchString)) != nullptr) {
+        ++count;
+        position += searchLength;
+    }
+
+    std::cout << "����� ��������� ������: " << count << std::endl;
+
+    delete[] buffer;
+    return 0;
+}
diff --git a/Контрольные вопросы.docx b/Контрольные вопросы.docx
new file mode 100644
index 0000000..b4a6ed0
Binary files /dev/null and b/Контрольные вопросы.docx differ
diff --git a/задание 1.cpp b/задание 1.cpp
new file mode 100644
index 0000000..3b0f4d5
--- /dev/null
+++ b/задание 1.cpp	
@@ -0,0 +1,49 @@
+#include <iostream>
+#include <iomanip>
+
+void print_in_hex(uint8_t byte) {
+    std::cout << std::hex << std::setw(2) << std::setfill('0') << static_cast<int>(byte) << " ";
+}
+
+void print_in_hex(const void* data, size_t size) {
+    const uint8_t* bytes = static_cast<const uint8_t*>(data);
+    for (size_t i = 0; i < size; ++i) {
+        print_in_hex(bytes[i]);
+        if ((i + 1) % 16 == 0) std::cout << std::endl;
+    }
+    std::cout << std::endl;
+}
+
+void print_in_binary(uint8_t byte) {
+    for (int i = 7; i >= 0; --i) {
+        std::cout << ((byte >> i) & 1);
+    }
+    std::cout << " ";
+}
+
+void print_in_binary(const void* data, size_t size) {
+    const uint8_t* bytes = static_cast<const uint8_t*>(data);
+    for (size_t i = 0; i < size; ++i) {
+        print_in_binary(bytes[i]);
+        if ((i + 1) % 4 == 0) std::cout << std::endl;
+    }
+    std::cout << std::endl;
+}
+
+int main() {
+    uint8_t byte = 0b10101010;
+    uint8_t data[] = {0b00000001, 0b00000010, 0b00000011, 0b00000100,
+                      0b00000101, 0b00000110, 0b00000111, 0b00001000,
+                      0b00001001, 0b00001010, 0b00001011, 0b00001100,
+                      0b00001101, 0b00001110, 0b00001111, 0b00010000};
+
+    print_in_hex(byte);
+    std::cout << std::endl;
+    print_in_hex(data, sizeof(data));
+
+    print_in_binary(byte);
+    std::cout << std::endl;
+    print_in_binary(data, sizeof(data));
+
+    return 0;
+}
diff --git a/задание 2.cpp b/задание 2.cpp
new file mode 100644
index 0000000..41c008a
--- /dev/null
+++ b/задание 2.cpp	
@@ -0,0 +1,43 @@
+#include <iostream>
+#include <bitset>
+#include <cstdint>
+#include <iomanip>
+
+int main() {
+    uint16_t operand1, operand2;
+    char operation;
+
+    std::cout << "������� ������ ������� (0-65535): ";
+    std::cin >> operand1;
+
+    std::cout << "������� �������� (&, |, ^): ";
+    std::cin >> operation;
+
+    std::cout << "������� ������ ������� (0-65535): ";
+    std::cin >> operand2;
+
+    uint16_t result;
+
+    switch (operation) {
+        case '&':
+            result = operand1 & operand2;
+            break;
+        case '|':
+            result = operand1 | operand2;
+            break;
+        case '^':
+            result = operand1 ^ operand2;
+            break;
+        default:
+            std::cerr << "������: �������� ��������!" << std::endl;
+            return 1;
+    }
+
+    std::cout << "��������� � ����������������� ����: 0x"
+              << std::hex << std::uppercase << result << std::endl;
+
+    std::cout << "��������� � �������� ����: "
+              << std::bitset<16>(result) << std::endl;
+
+    return 0;
+}