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Vector.cpp

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+#include <iostream>
+#include <stdexcept>
+
+class Vector {
+private:
+    int* data;
+    size_t size;
+    size_t count;
+
+
+public:
+    Vector();
+    ~Vector();
+    
+    void resize(size_t new_size);
+    
+    int& operator[](size_t index);
+    size_t get_count() const;
+    void push_back(int value);
+};
+
+// Constructor
+Vector::Vector() : data(nullptr), size(0), count(0) {}
+
+// Destructor
+Vector::~Vector() {
+    delete[] data;
+}
+
+// Overloaded operator[]
+int& Vector::operator[](size_t index) {
+    if (index >= count) {
+        std::cout << "index out of range";
+    }
+    return data[index];
+}
+
+// get_count() function
+size_t Vector::get_count() const {
+    return count;
+}
+
+// resize() function
+void Vector::resize(size_t new_size) {
+    if (new_size > size) {
+        int* new_data = new int[new_size];
+        for (size_t i = 0; i < count; ++i) {
+            new_data[i] = data[i];
+        }
+        delete[] data;
+        data = new_data;
+        size = new_size;
+    }
+    count = new_size;
+}
+
+// push_back() function
+void Vector::push_back(int value) {
+    if (count == size) {
+        size_t new_size = size++;
+        resize(new_size);
+    }
+    data[count++] = value;
+}
+
+int main() {
+    Vector vec;
+
+    vec.push_back(1);
+    vec.push_back(2);
+    vec.push_back(3);
+
+    std::cout << "Vector count: " << vec.get_count() << std::endl;
+
+    for (size_t i = 0; i < vec.get_count(); ++i) {
+        std::cout << "vec[" << i << "] = " << vec[i] << std::endl;
+    }
+
+    vec.resize(5);
+    std::cout << "Vector count after resize: " << vec.get_count() << std::endl;
+
+    for (size_t i = 0; i < vec.get_count(); ++i) {
+        std::cout << "vec[" << i << "] = " << vec[i] << std::endl;
+    }
+
+    return 0;
+}