new

lab4/task_1.cpp

@@ -0,0 +1,45 @@
+
+#include <iostream>
+#include <iomanip>
+#include <cstdint>
+using namespace std;
+
+void print_in_hex(uint8_t byte) {
+    cout << hex << setw(2) << 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) cout << endl;
+    }
+    cout << endl;
+}
+
+void print_in_binary(uint8_t byte) {
+    for (int i = 7; i >= 0; --i) cout << ((byte >> i) & 1);
+    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) cout << endl;
+    }
+    cout << endl;
+}
+
+int main() {
+    uint8_t data[] = {0xDE, 0xAD, 0xBE, 0xEF, 0x12, 0x34, 0x56, 0x78};
+    size_t size = sizeof(data);
+
+    cout << "Hexadecimal representation:" << endl;
+    print_in_hex(data, size);
+
+    cout << "Binary representation:" << endl;
+    print_in_binary(data, size);
+
+    return 0;
+}

lab4/task_2.cpp

@@ -0,0 +1,31 @@
+
+#include <iostream>
+#include <iomanip>
+#include <bitset>
+using namespace std;
+
+int main() {
+    uint16_t operand1, operand2;
+    char operation;
+
+    cout << "Enter first operand: ";
+    cin >> operand1;
+    cout << "Enter operation (&, |, ^): ";
+    cin >> operation;
+    cout << "Enter second operand: ";
+    cin >> operand2;
+
+    uint16_t result = 0;
+    if (operation == '&') result = operand1 & operand2;
+    else if (operation == '|') result = operand1 | operand2;
+    else if (operation == '^') result = operand1 ^ operand2;
+    else {
+        cout << "Invalid operation" << endl;
+        return 1;
+    }
+
+    cout << "Hexadecimal: " << hex << setw(4) << setfill('0') << result << endl;
+    cout << "Binary: " << bitset<16>(result) << endl;
+
+    return 0;
+}

lab4/task_3.cpp

@@ -0,0 +1,40 @@
+
+#include <iostream>
+#include <iomanip>
+#include <cstring>
+#include <cstdint>
+using namespace std;
+
+struct Student {
+    char name[17];
+    uint16_t enrollment_year;
+    float gpa;
+    uint8_t gender : 1; // 0 = female, 1 = male
+    uint8_t courses_completed;
+    Student* group_leader;
+};
+
+void print_memory_info(const Student& student) {
+    cout << "Name address: " << &student.name << ", size: " << sizeof(student.name) << endl;
+    cout << "Year address: " << &student.enrollment_year << ", size: " << sizeof(student.enrollment_year) << endl;
+    cout << "GPA address: " << &student.gpa << ", size: " << sizeof(student.gpa) << endl;
+    cout << "Gender address: " << &student.gender << ", size: 1 bit" << endl;
+    cout << "Courses address: " << &student.courses_completed << ", size: " << sizeof(student.courses_completed) << endl;
+    cout << "Leader address: " << &student.group_leader << ", size: " << sizeof(student.group_leader) << endl;
+}
+
+int main() {
+    Student students[3] = {
+        {"Alice", 2021, 3.8, 0, 5, nullptr},
+        {"Bob", 2021, 3.5, 1, 4, nullptr},
+        {"Charlie", 2020, 3.9, 1, 6, &students[0]}
+    };
+
+    for (size_t i = 0; i < 3; ++i) {
+        cout << "Student " << i + 1 << " memory info:" << endl;
+        print_memory_info(students[i]);
+        cout << endl;
+    }
+
+    return 0;
+}

lab4/task_4.cpp

@@ -0,0 +1,63 @@
+
+#include <iostream>
+#include <fstream>
+#include <cstring>
+using namespace std;
+
+bool is_valid_filename(const char* filename) {
+    const char* invalid_chars = "*<>?|";
+    if (strpbrk(filename, invalid_chars)) return false;
+
+    const char* colon = strchr(filename, ':');
+    if (colon && (colon != filename + 1 || !isalpha(filename[0]) || colon[1] != '\n')) return false;
+
+    const char* ext = strrchr(filename, '.');
+    if (ext && strcasecmp(ext, ".txt") != 0) return false;
+
+    return true;
+}
+
+void add_txt_extension(char* filename) {
+    strcat(filename, ".txt");
+}
+
+int main() {
+    char filename[256];
+    cout << "Enter filename: ";
+    cin >> filename;
+
+    if (!is_valid_filename(filename)) {
+        cout << "Invalid filename." << endl;
+        return 1;
+    }
+
+    if (!strrchr(filename, '.')) add_txt_extension(filename);
+
+    ifstream file(filename, ios::binary | ios::ate);
+    if (!file.is_open()) {
+        cout << "Failed to open file." << endl;
+        return 1;
+    }
+
+    streamsize size = file.tellg();
+    file.seekg(0, ios::beg);
+
+    char* buffer = new char[size];
+    file.read(buffer, size);
+
+    char search[256];
+    cout << "Enter string to search: ";
+    cin >> search;
+
+    size_t count = 0;
+    char* pos = buffer;
+    while ((pos = strstr(pos, search))) {
+        ++count;
+        pos += strlen(search);
+    }
+
+    cout << "Occurrences: " << count << endl;
+
+    delete[] buffer;
+    return 0;
+}