Write a C++ Program to Show Counter using Constructor

What is Class and Objects in C++?

• Class is a user defined data type, which holds its own data members and member functions, which can be accessed and used by creating instance of that class.
• The variables inside class definition are called as data members and the functions are called member functions.
• Class is just a blue print, which declares and defines characteristics and behavior, namely data members and member functions respectively. And all objects of this class will share these characteristics and behavior.

• Objects are instances of class, which holds the data variables declared in class and the member functions work on these class objects.
• Each object has different data variables. Objects are initialized using special class functions called Constructors.

Below is the source code for C++ Program to Show Counter using Constructor which is successfully compiled and run on Windows System to produce desired output as shown below :

SOURCE CODE : :

/* C++ Program to Show Counter using Constructor  */

#include<iostream>
using namespace std;

class counter
{
    private:
        int count;
    public:
        counter ()        // constructor
        {
            count=0;
        }

        void inc_count ()
        {
            count++;
        }

        int get_count ()
        {
            return count;
        }
};

int main ()
{
    counter c1;
    cout<<"\nBefore calling Counter Function, Count = ";
    cout<<c1.get_count ();

    c1.inc_count ();
    cout<<"\n\nAfter calling Counter Function, Count = ";
    cout<<c1.get_count ();

    cout<<"\n";

    return 0;
}

OUTPUT : :

/* C++ Program to Show Counter using Constructor  */

Before calling Counter Function, Count = 0

After calling Counter Function, Count = 1

Process returned 0

Above is the source code and output for C++ Program to Show Counter using Constructor which is successfully compiled and run on Windows System to produce desired output.