Dynamic Object Creation in C++

1#include <iostream>
2#include <string>
3using namespace std;
4
5class Student {
6private:
7    string name;
8    int age;
9    int* marks;
10    int numSubjects;
11
12public:
13    Student(string n, int a, int nSub) {
14        name = n;
15        age = a;
16        numSubjects = nSub;
17        marks = new int[numSubjects];  // Dynamic array in object
18    }
19    
20    void setMarks() {
21        cout << "Enter marks for " << numSubjects << " subjects: ";
22        for (int i = 0; i < numSubjects; i++) {
23            cin >> marks[i];
24        }
25    }
26    
27    void display() {
28        cout << "Name: " << name << endl;
29        cout << "Age: " << age << endl;
30        cout << "Marks: ";
31        for (int i = 0; i < numSubjects; i++) {
32            cout << marks[i] << " ";
33        }
34        cout << endl;
35    }
36    
37    ~Student() {
38        delete[] marks;  // Free dynamic array
39        cout << "Destructor called for " << name << endl;
40    }
41};
42
43int main() {
44    // Dynamically create object
45    Student* student1 = new Student("Alice", 20, 3);
46    student1->setMarks();
47    
48    cout << "\nStudent 1:" << endl;
49    student1->display();
50    
51    // Create another object
52    Student* student2 = new Student("Bob", 19, 3);
53    student2->setMarks();
54    
55    cout << "\nStudent 2:" << endl;
56    student2->display();
57    
58    // Free objects
59    delete student1;
60    delete student2;
61    
62    cout << "\nObjects deleted" << endl;
63    
64    return 0;
65}