Добавлены задачи 3 и 4.

lab04_LitvinovaAnna/Task3/Task3.vcxproj

@@ -19,7 +19,7 @@
     </ProjectConfiguration>
   </ItemGroup>
   <ItemGroup>
-    <ClCompile Include="..\..\..\main.cpp" />
+    <ClCompile Include="main.cpp" />
   </ItemGroup>
   <PropertyGroup Label="Globals">
     <VCProjectVersion>17.0</VCProjectVersion>

lab04_LitvinovaAnna/Task3/Task3.vcxproj.filters

@@ -15,7 +15,7 @@
     </Filter>
   </ItemGroup>
   <ItemGroup>
-    <ClCompile Include="..\..\..\main.cpp">
+    <ClCompile Include="main.cpp">
       <Filter>Исходные файлы</Filter>
     </ClCompile>
   </ItemGroup>

lab04_LitvinovaAnna/Task3/main.cpp

@@ -0,0 +1,167 @@
+#include <cstddef>
+#include <cstdint>
+#include <cstring>
+#include <iomanip>
+#include <iostream>
+#include <windows.h>  // Äîáàâëåíî äëÿ ðàáîòû ñ êîäèðîâêîé
+
+// Ñòðóêòóðà ñ áèòîâûì ïîëåì è îáÿçàòåëüíûìè àòðèáóòàìè
+struct Student {
+    char name[17];
+    uint16_t year;
+    float gpa;
+    uint8_t gender : 1;   // 0 — æåí, 1 — ìóæ
+    uint8_t courses : 7;
+    Student* captain;
+};
+
+// Ïå÷àòü îäíîãî áàéòà â hex
+static void print_in_hex(uint8_t byte) {
+    static const char digits[] = "0123456789ABCDEF";
+    std::cout << digits[byte >> 4] << digits[byte & 0x0F];
+}
+
+// Ïå÷àòü áëîêà â hex ñ ðàçðûâîì ñòðîê êàæäûå 16 áàéò
+static 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 != size) {
+            std::cout << ' ';
+        }
+        if ((i + 1) % 16 == 0 && i + 1 != size) {
+            std::cout << '\n';
+        }
+    }
+}
+
+// Ïå÷àòü îäíîãî áàéòà â äâîè÷íîì âèäå
+static void print_in_binary(uint8_t byte) {
+    for (int bit = 7; bit >= 0; --bit) {
+        std::cout << ((byte >> bit) & 1);
+    }
+}
+
+// Ïå÷àòü áëîêà â äâîè÷íîì âèäå ñ ïåðåâîäîì ñòðîêè êàæäûå 4 áàéòà
+static 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 != size) {
+            std::cout << ' ';
+        }
+        if ((i + 1) % 4 == 0 && i + 1 != size) {
+            std::cout << '\n';
+        }
+    }
+}
+
+int main() {
+    // Íàñòðîéêà êîäèðîâêè êîíñîëè äëÿ ðóññêîãî òåêñòà
+    SetConsoleOutputCP(1251);
+    SetConsoleCP(1251);
+
+    Student group[3]{};
+
+    // Ñòàðîñòà
+    strcpy_s(group[0].name, "Smirnov Denis");  // Èñïðàâëåíî
+    group[0].year = 2022;
+    group[0].gpa = 4.6f;
+    group[0].gender = 1;
+    group[0].courses = 3;
+    group[0].captain = nullptr;
+
+    // Ñòóäåíòêè
+    strcpy_s(group[1].name, "Kuznetsova Al");  // Èñïðàâëåíî
+    group[1].year = 2022;
+    group[1].gpa = 4.9f;
+    group[1].gender = 0;
+    group[1].courses = 3;
+    group[1].captain = &group[0];
+
+    strcpy_s(group[2].name, "Belova Irina");  // Èñïðàâëåíî
+    group[2].year = 2021;
+    group[2].gpa = 4.3f;
+    group[2].gender = 0;
+    group[2].courses = 4;
+    group[2].captain = &group[0];
+
+    std::cout << "1) Ìàññèâ ñòóäåíòîâ\n";
+    std::cout << "  Àäðåñ: " << static_cast<const void*>(group) << '\n';
+    std::cout << "  Ðàçìåð: " << sizeof(group) << " áàéò\n\n";
+
+    std::cout << "2) Ýëåìåíòû ìàññèâà\n";
+    for (int i = 0; i < 3; ++i) {
+        std::cout << "  #" << i << " àäðåñ: " << static_cast<const void*>(&group[i])
+            << " ðàçìåð: " << sizeof(Student) << " áàéò\n";
+    }
+    std::cout << '\n';
+
+    std::cout << "3) Ïîëÿ âòîðîãî ñòóäåíòà (áåç ïîëà)\n";
+    std::cout << "  name\n";
+    std::cout << "    àäðåñ: " << static_cast<void*>(group[1].name) << '\n';
+    std::cout << "    ñìåùåíèå: " << offsetof(Student, name) << '\n';
+    std::cout << "    ðàçìåð: " << sizeof(group[1].name) << " áàéò\n";
+    std::cout << "    hex:\n";
+    print_in_hex(group[1].name, sizeof(group[1].name));
+    std::cout << "\n    bin:\n";
+    print_in_binary(group[1].name, sizeof(group[1].name));
+    std::cout << "\n\n";
+
+    std::cout << "  year\n";
+    std::cout << "    àäðåñ: " << static_cast<const void*>(&group[1].year) << '\n';
+    std::cout << "    ñìåùåíèå: " << offsetof(Student, year) << '\n';
+    std::cout << "    ðàçìåð: " << sizeof(group[1].year) << " áàéò\n";
+    std::cout << "    hex:\n";
+    print_in_hex(&group[1].year, sizeof(group[1].year));
+    std::cout << "\n    bin:\n";
+    print_in_binary(&group[1].year, sizeof(group[1].year));
+    std::cout << "\n\n";
+
+    std::cout << "  gpa\n";
+    std::cout << "    àäðåñ: " << static_cast<const void*>(&group[1].gpa) << '\n';
+    std::cout << "    ñìåùåíèå: " << offsetof(Student, gpa) << '\n';
+    std::cout << "    ðàçìåð: " << sizeof(group[1].gpa) << " áàéò\n";
+    std::cout << "    hex:\n";
+    print_in_hex(&group[1].gpa, sizeof(group[1].gpa));
+    std::cout << "\n    bin:\n";
+    print_in_binary(&group[1].gpa, sizeof(group[1].gpa));
+    std::cout << "\n\n";
+
+    std::cout << "  captain\n";
+    std::cout << "    àäðåñ: " << static_cast<const void*>(&group[1].captain) << '\n';
+    std::cout << "    ñìåùåíèå: " << offsetof(Student, captain) << '\n';
+    std::cout << "    ðàçìåð: " << sizeof(group[1].captain) << " áàéò\n";
+    std::cout << "    hex:\n";
+    print_in_hex(&group[1].captain, sizeof(group[1].captain));
+    std::cout << "\n    bin:\n";
+    print_in_binary(&group[1].captain, sizeof(group[1].captain));
+    std::cout << "\n\n";
+
+    std::cout << "4) Ñòðóêòóðû â hex\n";
+    for (int i = 0; i < 3; ++i) {
+        std::cout << "  Ñòóäåíò #" << i
+            << (i == 0 ? " (ñòàðîñòà)" : "") << '\n';
+        std::cout << "    âñå ïîëÿ:\n";
+        print_in_hex(&group[i], sizeof(Student));
+        std::cout << '\n';
+        std::cout << "    name:\n";
+        print_in_hex(&group[i].name, sizeof(group[i].name));
+        std::cout << '\n';
+        std::cout << "    year:\n";
+        print_in_hex(&group[i].year, sizeof(group[i].year));
+        std::cout << '\n';
+        std::cout << "    gpa:\n";
+        print_in_hex(&group[i].gpa, sizeof(group[i].gpa));
+        std::cout << '\n';
+        uint8_t packed = static_cast<uint8_t>((group[i].gender << 7) | group[i].courses);
+        std::cout << "    gender+courses (áàéò):\n";
+        print_in_hex(&packed, sizeof(packed));
+        std::cout << '\n';
+        std::cout << "    captain:\n";
+        print_in_hex(&group[i].captain, sizeof(group[i].captain));
+        std::cout << "\n\n";
+    }
+
+    return 0;
+}

lab04_LitvinovaAnna/Task4/Task4.vcxproj

@@ -19,7 +19,7 @@
     </ProjectConfiguration>
   </ItemGroup>
   <ItemGroup>
-    <ClCompile Include="..\..\..\main.cpp" />
+    <ClCompile Include="main.cpp" />
   </ItemGroup>
   <PropertyGroup Label="Globals">
     <VCProjectVersion>17.0</VCProjectVersion>

lab04_LitvinovaAnna/Task4/Task4.vcxproj.filters

@@ -15,7 +15,7 @@
     </Filter>
   </ItemGroup>
   <ItemGroup>
-    <ClCompile Include="..\..\..\main.cpp">
+    <ClCompile Include="main.cpp">
       <Filter>Исходные файлы</Filter>
     </ClCompile>
   </ItemGroup>

lab04_LitvinovaAnna/Task4/main.cpp

@@ -0,0 +1,149 @@
+#include <cctype>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <iostream>
+#include <windows.h>  // Äîáàâëåíî äëÿ ðàáîòû ñ êîäèðîâêîé
+
+// Ìàêñèìóìû äëÿ áóôåðîâ (ñòåêîâûå ìàññèâû)
+constexpr std::size_t kMaxFilenameLen = 260;
+constexpr std::size_t kMaxQueryLen = 256;
+
+// Íàáîð çàïðåùåííûõ ñèìâîëîâ äëÿ èìåíè ôàéëà (Windows)
+constexpr const char* kForbidden = "*\"<>?|";
+
+// Ïðîâåðêà âàëèäíîñòè èìåíè ôàéëà ïî ïðàâèëàì çàäàíèÿ
+bool validate_filename(const char* name) {
+    // çàïðåòíûå ñèìâîëû
+    for (const char* p = kForbidden; *p; ++p) {
+        if (std::strchr(name, *p)) {
+            return false;
+        }
+    }
+
+    // äâîåòî÷èå
+    const char* colon = std::strchr(name, ':');
+    if (colon) {
+        if (colon != name + 1) return false;      // òîëüêî âòîðîé ñèìâîë
+        if (!std::isalpha(static_cast<unsigned char>(name[0]))) return false;
+        if (colon[1] != '\\') return false;       // çà äâîåòî÷èåì îáðàòíàÿ êîñàÿ
+    }
+
+    // ðàñøèðåíèå .txt (åñëè îíî åñòü)
+    const char* dot = std::strrchr(name, '.');
+    if (dot) {
+        if (std::strlen(dot) != 4) return false;  // ".txt"
+        char ext[5]{};
+        // Èñïðàâëåíî: strncpy_s âìåñòî strncpy
+        strncpy_s(ext, sizeof(ext), dot, 4);
+        for (char& c : ext) c = static_cast<char>(std::tolower(static_cast<unsigned char>(c)));
+        if (std::strcmp(ext, ".txt") != 0) return false;
+    }
+
+    return true;
+}
+
+// Äîáàâèòü .txt, åñëè òî÷êè íåò
+void ensure_txt_extension(char* name, size_t bufferSize) {
+    if (std::strrchr(name, '.') == nullptr) {
+        // Èñïðàâëåíî: strcat_s âìåñòî strcat
+        strcat_s(name, bufferSize, ".txt");
+    }
+}
+
+// Ïîäñ÷èòàòü âõîæäåíèÿ ïîäñòðîêè sub â ñòðîêå text
+int count_occurrences(const char* text, const char* sub) {
+    int count = 0;
+    const std::size_t len = std::strlen(sub);
+    if (len == 0) return 0;
+
+    const char* pos = text;
+    while ((pos = std::strstr(pos, sub)) != nullptr) {
+        ++count;
+        pos += len;
+    }
+    return count;
+}
+
+int main() {
+    // Íàñòðîéêà êîäèðîâêè êîíñîëè äëÿ ðóññêîãî òåêñòà
+    SetConsoleOutputCP(1251);
+    SetConsoleCP(1251);
+
+    // 4.1: ââîä èìåíè ôàéëà (ñòåêîâûé áóôåð)
+    char filename[kMaxFilenameLen]{};
+    std::cout << "Ââåäèòå èìÿ ôàéëà: ";
+    std::cin.getline(filename, kMaxFilenameLen);
+
+    // 4.2: ïðîâåðêà êîððåêòíîñòè
+    if (!validate_filename(filename)) {
+        std::cout << "Íåêîððåêòíîå èìÿ ôàéëà\n";
+        return 1;
+    }
+
+    // 4.3: äîáàâèòü .txt ïðè îòñóòñòâèè
+    ensure_txt_extension(filename, sizeof(filename));
+    if (!validate_filename(filename)) {
+        std::cout << "Èìÿ íåêîððåêòíî ïîñëå äîáàâëåíèÿ .txt\n";
+        return 1;
+    }
+
+    // 4.4: ÷òåíèå ôàéëà ïîëíîñòüþ â äèíàìè÷åñêèé áóôåð
+    FILE* f = nullptr;
+    // Èñïðàâëåíî: fopen_s âìåñòî fopen
+    if (fopen_s(&f, filename, "rb") != 0 || !f) {
+        std::cout << "Íå óäàëîñü îòêðûòü ôàéë: " << filename << "\n";
+        return 1;
+    }
+
+    if (std::fseek(f, 0, SEEK_END) != 0) {
+        std::cout << "Îøèáêà ïåðåìåùåíèÿ â êîíåö ôàéëà\n";
+        std::fclose(f);
+        return 1;
+    }
+
+    long sz = std::ftell(f);
+    if (sz < 0) {
+        std::cout << "Íå óäàëîñü îïðåäåëèòü ðàçìåð ôàéëà\n";
+        std::fclose(f);
+        return 1;
+    }
+    std::rewind(f);
+
+    char* buffer = static_cast<char*>(std::malloc(static_cast<std::size_t>(sz) + 1));
+    if (!buffer) {
+        std::cout << "Íå óäàëîñü âûäåëèòü ïàìÿòü\n";
+        std::fclose(f);
+        return 1;
+    }
+
+    std::size_t read = std::fread(buffer, 1, static_cast<std::size_t>(sz), f);
+    if (read != static_cast<std::size_t>(sz)) {
+        std::cout << "Îøèáêà ÷òåíèÿ ôàéëà\n";
+        std::free(buffer);
+        std::fclose(f);
+        return 1;
+    }
+    buffer[sz] = '\0';
+    std::fclose(f);
+
+    // 4.5: ââîä èñêîìîé ñòðîêè (ñòåêîâûé áóôåð)
+    char query[kMaxQueryLen]{};
+    std::cout << "Ââåäèòå ñòðîêó äëÿ ïîèñêà: ";
+    std::cin.getline(query, kMaxQueryLen);
+
+    // 4.6: ïîäñ÷¸ò âõîæäåíèé
+    const std::size_t qlen = std::strlen(query);
+    if (qlen == 0) {
+        std::cout << "Ïóñòàÿ ñòðîêà ïîèñêà\n";
+        std::free(buffer);
+        return 1;
+    }
+
+    int hits = count_occurrences(buffer, query);
+    std::cout << "×èñëî âõîæäåíèé \"" << query << "\": " << hits << "\n";
+
+    // 4.7: îñâîáîæäåíèå ïàìÿòè
+    std::free(buffer);
+    return 0;
+}