Static Member Example in C++

This code defines a Student class with member variables rollno and name, as well as a static int variable addminNo that keeps track of the next admission number. The constructor initializes the name and rollno member variables, increment the addminNo static variable, and assigns the current value of addminNo to the rollno.

In the main function, two Student objects s1 and s2 are created with names "Ram" and "Sam" respectively, and their display method is called to print their name and roll number. Finally, the addminNo static variable is accessed via the Student class to print the next admission number.

This code demonstrates the use of static member variables to keep track of a value that is shared across all instances of a class. In this case, the addminNo variable is incremented each time a new Student object is created, ensuring that each student gets a unique roll number.

Source Code

#include<iostream>
//Static Member Variable
using namespace std;
class Student
{
public:
    int rollno;
    string name;
    static int addminNo;
    Student(string n)
    {
        name=n;
        addminNo++;
        rollno=addminNo;
    }
    void display()
    {
        cout<<"Name : "<<name<<" | Roll No : "<<rollno<<endl;
    }
};
int Student::addminNo=0;
int main()
{
    Student s1("Ram");
    s1.display();
    Student s2("Sam");
    s2.display();
    cout<<"Next Admission No  : "<<(Student::addminNo)+1<<endl;
}
/*
Use of static member
Shared memory
provide info about class
*/

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Output

Name : Ram | Roll No : 1
Name : Sam | Roll No : 2
Next Admission No  : 3

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