commit f9d493774132568ff842eea11a305f43df7d0d57
Author: TereshchenkoIY <tereshchenkoiy@mpei.ru>
Date: Thu Dec 14 02:42:40 2023 +0300
first commit
diff --git a/Exercise1.cpp b/Exercise1.cpp
new file mode 100644
index 0000000..dc0e906
--- /dev/null
+++ b/Exercise1.cpp
@@ -0,0 +1,73 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <locale.h>
+#include <cstdlib>
+
+void print_in_hex(uint8_t byte)
+{
+ printf("%04X ", byte);
+}
+
+void print_in_hex(const void* data, size_t size)
+{
+ const uint8_t* bytes = (const uint8_t*)data;
+ for (size_t i = 0; i < size; i++)
+ {
+ print_in_hex(bytes[i]);
+ if ((i + 1) % 16 == 0)
+ printf("\n");
+ }
+ printf("\n");
+}
+
+void print_in_binary(uint8_t byte)
+{
+ for (int i = 7; i >= 0; i--)
+ {
+ printf("%d", (byte >> i) & 1);
+ if (i % 4 == 0)
+ printf(" ");
+ }
+}
+
+void print_in_binary(const void* data, size_t size)
+{
+ const uint8_t* bytes = (const uint8_t*)data;
+ for (size_t i = 0; i < size; ++i)
+ {
+ print_in_binary(bytes[i]);
+ if ((i + 1) % 4 == 0)
+ printf("\n");
+ }
+ printf("\n");
+}
+
+int main()
+{
+ uint8_t byte = 127;
+
+ printf("Source number: %hhu\n", byte);
+ printf("Number in hexadecimal: ");
+ print_in_hex(byte);
+ printf("\n");
+ printf("Binary number: ");
+ print_in_binary(byte);
+ printf("\n");
+ printf("\n");
+ const int SIZE = 10;
+ uint8_t data[] = { 0x12, 0x34, 0x56, 0x78, 0x9A, 0xBC, 0xDE, 0xF0, 0x00, 0xA1 };
+ size_t size = sizeof(data);
+
+ printf("Source data block in decimal form\n");
+ for (int i = 0; i < SIZE; ++i)
+ printf("%hhu ", data[i]);
+ printf("\n");
+
+ printf("Data block in hexadecimal\n");
+ print_in_hex(data, size);
+ printf("Binary data block\n");
+ print_in_binary(data, size);
+
+ system("pause");
+ return 0;
+}
diff --git a/Exercise2.cpp b/Exercise2.cpp
new file mode 100644
index 0000000..bb6bc56
--- /dev/null
+++ b/Exercise2.cpp
@@ -0,0 +1,68 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <locale.h>
+#include <cstdlib>
+
+uint16_t reverse(uint16_t x)
+{
+ x = (x & 0xFF) << 8 | (x & 0xFF00) >> 8;
+ return x;
+}
+
+void print_in_hex(uint16_t num)
+{
+ printf("%04X ", num);
+}
+
+void print_in_binary(uint16_t num)
+{
+ for (int i = 15; i >= 0; i--)
+ {
+ printf("%d", (num >> i) & 1);
+ if (i % 8 == 0)
+ printf(" ");
+ }
+}
+
+int main()
+{
+ uint16_t operand1, operand2;
+ char symbol;
+ printf("Enter the first operand, then the operator(&, | or ^), then the second operand.\n");
+ scanf("%hu %c %hu", &operand1, &symbol, &operand2);
+
+ operand1 = reverse(operand1);
+ operand2 = reverse(operand2);
+
+ uint16_t result;
+ switch (symbol)
+ {
+ case '&':
+ result = operand1 & operand2;
+ break;
+ case '|':
+ result = operand1 | operand2;
+ break;
+ case '^':
+ result = operand1 ^ operand2;
+ break;
+ default:
+ printf("Invalid operator\n");
+ return 1;
+ }
+
+ printf("\nResult: ");
+ print_in_hex(operand1);
+ printf("%c ", symbol);
+ print_in_hex(operand2);
+ printf("= ");
+ print_in_binary(operand1);
+ printf("%c ", symbol);
+ print_in_binary(operand2);
+ printf("= ");
+ print_in_binary(result);
+ printf("\n");
+
+ system("pause");
+ return 0;
+}
diff --git a/Exercise3.cpp b/Exercise3.cpp
new file mode 100644
index 0000000..337f2de
--- /dev/null
+++ b/Exercise3.cpp
@@ -0,0 +1,121 @@
+#include <iostream>
+#include <cstddef>
+#include <cstdlib>
+#include <cstring>
+
+using namespace std;
+
+void print_in_hex(uint8_t byte)
+{
+ printf("%02X ", byte);
+}
+
+void print_in_hex(const void* data, size_t size)
+{
+ const uint8_t* bytes = (const uint8_t*)data;
+ for (size_t i = 0; i < size; i++)
+ {
+ print_in_hex(bytes[i]);
+ if ((i + 1) % 8 == 0)
+ printf("\n");
+ }
+ printf("\n");
+}
+
+void print_in_binary(uint8_t byte)
+{
+ for (int i = 7; i >= 0; i--)
+ {
+ printf("%d", (byte >> i) & 1);
+ if (i % 8 == 0)
+ printf(" ");
+ }
+}
+
+void print_in_binary(const void* data, size_t size)
+{
+ const uint8_t* bytes = (const uint8_t*)data;
+ for (size_t i = 0; i < size; ++i)
+ {
+ print_in_binary(bytes[i]);
+ if ((i + 1) % 8 == 0)
+ printf("\n");
+ }
+}
+
+#pragma pack(1)
+
+struct Student
+{
+ char _name[17];
+ uint16_t _year;
+ float _averageGrade;
+ uint8_t _gender : 1;
+ // 0 - female, 1 - male
+ uint8_t _numCourses : 7;
+ Student* _leader;
+};
+#pragma pack()
+
+int main()
+{
+ Student students[3] = {0};
+
+ strcpy(students[0]._name, "Alex");
+ students[0]._year = 2021;
+ students[0]._averageGrade = 3.7f;
+ students[0]._gender = 1;
+ students[0]._numCourses = 6;
+ students[0]._leader = nullptr;
+
+ strcpy(students[1]._name, "Masha");
+ students[1]._year = 2020;
+ students[1]._averageGrade = 4.6f;
+ students[1]._gender = 0;
+ students[1]._numCourses = 4;
+ students[1]._leader = &students[0];
+
+ strcpy(students[2]._name, "John");
+ students[2]._year = 2021;
+ students[2]._averageGrade = 4.1f;
+ students[2]._gender = 1;
+ students[2]._numCourses = 5;
+ students[2]._leader = &students[0];
+
+ cout << "Array address: " << &students << endl;
+ cout << "Array size: " << sizeof(students) << " byte" << endl;
+
+ for (int i = 0; i < 3; i++)
+ {
+ cout << "Element address " << i << ": " << &students[i] << endl;
+ cout << "Element Size " << i << ": " << sizeof(students[i]) << " byte" << endl;
+ }
+
+ int index = 1;
+ Student& student = students[index];
+ cout << "Student information " << index << ":" << endl;
+ cout << "Field value _name: " << student._name << endl;
+ cout << "Field address _name: " << &(student._name) << endl;
+ cout << "Field offset _name from the beginning of the structure: " << offsetof(Student, _name) << " byte" << endl;
+ cout << "Field size _name: " << sizeof(student._name) << " byte" << endl;
+ cout << "Hexadecimal representation of the field _name:" << endl;
+ print_in_hex(student._name, sizeof(student._name));
+ cout << "Binary field representation _name:" << endl;
+ print_in_binary(student._name, sizeof(student._name));
+ cout << endl;
+
+ cout << "Array elements in hexadecimal:" << endl;
+ cout << "(First " << sizeof(student._name) << " byte - field _name):" << endl;
+ cout << "(Next " << sizeof(student._year) << " bytes - field _year):" << endl;
+ cout << "(Next " << sizeof(student._averageGrade) << " bytes - field _averageGrade):" << endl;
+ cout << "(Next " << sizeof(uint8_t) << " bytes - 1 bit for _gender and 7 bit for _numCourses):" << endl;
+ cout << "(Next " << sizeof(student._leader) << " bytes - field _leader):" << endl;
+ for (int i = 0; i < 3; i++)
+ {
+ cout << "Student with index " << i << endl;
+ print_in_hex(&students[i], sizeof(students[i]));
+ }
+
+ system("pause");
+ return 0;
+}
diff --git a/Exercise4.cpp b/Exercise4.cpp
new file mode 100644
index 0000000..bbf2311
--- /dev/null
+++ b/Exercise4.cpp
@@ -0,0 +1,65 @@
+#include <iostream>
+#include <fstream>
+#include <cstring>
+#include <cctype>
+
+using namespace std;
+
+int main()
+{
+
+ char filename[256];
+ cout << "Enter file name: ";
+ cin.getline(filename, sizeof(filename));
+
+ bool isValid = true;
+
+ const char* forbiddenChars = "*\"<>?|";
+ if (strpbrk(filename, forbiddenChars) != 0)
+ isValid = false;
+
+ if (strchr(filename, ':') != nullptr &&
+ (filename[1] != '\\' || !isalpha(filename[0]) ||
+ strchr(filename, '\\') != strrchr(filename, '\\')))
+ isValid = false;
+
+ if (strchr(filename, '.') == NULL) {
+ strcat(filename, ".txt");
+ }
+
+ if (isValid)
+ {
+ ifstream file(filename, ios::binary | ios::ate);
+ if (file.is_open())
+ {
+ streampos fileSize = file.tellg();
+ char* buffer = new char[fileSize];
+ file.seekg(0, ios::beg);
+ file.read(buffer, fileSize);
+ file.close();
+
+ char searchString[256];
+ cout << "Enter a search string: ";
+ cin.getline(searchString, sizeof(searchString));
+
+ int count = 0;
+ char* p = buffer;
+ while ((p = strstr(p, searchString)) != nullptr)
+ {
+ count++;
+ p += strlen(searchString);
+ }
+
+ cout << "Number of occurrences of a string \"" << searchString << "\" in a text file: " << count << endl;
+
+ delete[] buffer;
+ }
+ else
+ cout << "Error opening file." << endl;
+ }
+ else
+ cout << "Invalid file name." << endl;
+
+ system("pause");
+ return 0;
+}
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..ce01362
--- /dev/null
+++ b/README.md
@@ -0,0 +1 @@
+hello