WAP in C++ to create database of the following items: Name of the student (String), Roll number of the student (int), Height of the student (cm), Weight of the student (kg/gms)

1) Create a Constructor to initialize values

2) Create display () function to display the details

3) Illustrate the use of copy constructor

4) Also implement the concept of destructor. 

Algorithm :

This program defines a Student class with a constructor, a display function, a copy constructor, and a destructor. It creates an object of the Student class and displays its details using the display function. Then it creates a copy of the first object using the copy constructor, displays its details, and calls the destructor for both objects.

Here's the algorithm for this program:

1. Define a Student class with private member variables for name, rollNumber, height, and weight, and public member functions for constructor, display function, copy constructor, and destructor.
2. Implement the constructor to initialize the member variables.
3. Implement the display function to display the member variables.

4. Implement the copy constructor to copy the member variables of an object to another object.

5. Implement the destructor to display a message when an object is destroyed.
6. In the main function, create an object of the Student class using the constructor and display its details using the display function.
7. Create a copy of the first object using the copy constructor and display its details using the display function.
8. Call the destructor explicitly for the first object.
9. The program will implicitly call the destructor for the second object when it goes out of scope.

Code:

#include <iostream>

#include <string>

using namespace std;

class Student {

private:

string name;

int rollNumber;

float height;

float weight;

public:

// Constructor to initialize values

Student(string name, int rollNumber, float height, float weight) {

this->name = name;

this->rollNumber = rollNumber;

this->height = height;

this->weight = weight;

}

// Display function to display the details

void display() {

cout << "Name: " << name << endl;

cout << "Roll Number: " << rollNumber << endl;

cout << "Height: " << height << " cm" << endl;

cout << "Weight: " << weight << " kg" << endl;

}

// Copy constructor

Student(const Student& obj) {

name = obj.name;

rollNumber = obj.rollNumber;

height = obj.height;

weight = obj.weight;

}

// Destructor

~Student() {

cout << "Destructor called for " << name << endl;

}

};

int main() {

// Create a student object using constructor

Student student1("Abhay", 123, 180, 70);

// Display the details

cout << "Details of student1:" << endl;

student1.display();

// Create a copy of student1 using copy constructor

Student student2 = student1;

// Display the details of the copied object

cout << "\nDetails of student2:" << endl;

student2.display();

// Call the destructor explicitly for student1

student1.~Student();

// Call the destructor implicitly for student2

return 0;

}

Output:

Details of student1:

Name: Abhay

Roll Number: 123

Height: 180 cm

Weight: 70 kg

Details of student2:

Name: Abhay

Roll Number: 123

Height: 180 cm

Weight: 70 kg

Destructor called for Abhay

Destructor called for Abhay

Destructor called for Abhay

Explanation:

This C++ program demonstrates the concept of constructors, copy constructors, and destructors using a class called Student.

The Student class has private member variables name, rollNumber, height, and weight, and public member functions to initialize these values using a constructor, display the values, and copy the object using a copy constructor. The class also has a destructor which is called when the object is destroyed.

The main() function first creates an object of the Student class using the constructor, initializes it with the values "Abhay", 123, 180, and 70, and displays the details of the object using the display() function.

Next, the program creates a copy of the object student1 using the copy constructor and stores it in student2. The details of student2 are displayed using the display() function.

Then, the destructor of student1 is called explicitly using the ~Student() function. Finally, the destructor of student2 is called implicitly when the program exits the main() function.

Overall, this program demonstrates how constructors, copy constructors, and destructors work in C++ classes.

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