Incrementing ID

Create a Person class with private member variables name and id. Add a static member variable next_id to generate unique IDs for each Person instance and set it to 0. Assign the next available ID to each new Person and increment next_id in the constructor. Print the id of each Person instance to demonstrate unique ID generation.

Hint

You need to initalize static variables outside the struct/class.

Answer

#include <iostream>
#include <string>

class Person {
    static int next_id;
public:
    std::string name;
    int id;

    // Constructor to initialize name and assign a unique id
    Person(const std::string& person_name) : name(person_name), id(next_id++) {}
};

// Initialize the static member variable
int Person::next_id = 1;

int main() {
    // Create instances of Person
    Person p1("Alice");
    Person p2("Bob");
    Person p3("Charlie");

    // Print the id of each Person instance
    std::cout << "Person 1: " << p1.name << ", ID: " << p1.id << std::endl;
    std::cout << "Person 2: " << p2.name << ", ID: " << p2.id << std::endl;
    std::cout << "Person 3: " << p3.name << ", ID: " << p3.id << std::endl;

    return 0;
}