Static Data Members in C++

This C++ program demonstrates the use of static members in a class. A static data member is shared by all objects of a class. We can put a static data member inside a class but we would have to initialize it outside the class using scope resolution operator (::).

Here is the source code of the C++ program demonstrates the use of static members in a class. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C++ Program to Demonstrate a Class with Static Members

```
 */
```
```
#include <iostream>
```
```
 
```
```
class Car {
```
```
    private:
```
```
        static std::string colour;
```
```
        std::string brand;
```
```
        std::string state;
```
```
        int model;  
```
```
    public:
```

        Car(int model, std::string brand, std::string state = "off")

```
        { 
```
```
            this->model = model; 
```
```
            this->brand = brand;
```
```
            this->state = state;
```
```
        }
```
```
        void engineOn()
```
```
        {
```
```
            state = "on";   
```
```
        }
```
```
        void knowState()
```
```
        {
```

            std::cout << "Is " << brand << " ready?" << std::endl;

```
        }
```
```
        void isReady()
```
```
        {
```
```
            if(state == "on")
```

                std::cout << colour << " " << brand

                          << " is ready to go!" << std::endl;

```
            else
```

                std::cout << colour << " " << brand

                          << " is not ready!" << std::endl;

```
        }
```
```
};
```
```
 
```

// Definition of a protected static member

```
// Legal expression
```
```
std::string Car::colour = "Red";
```
```
 
```
```
int main()
```
```
{
```

    Car chevy(1965, "Chevy Mint", "on");

```
    chevy.knowState();
```
```
    chevy.isReady();
```
```
    Car ferrari(1965, "Ferrari" );
```
```
    ferrari.knowState();
```
```
    ferrari.isReady();
```
```
}
```

$ a.out
Is Chevy Mint ready?
Red Chevy Mint is ready to go!
Is Ferrari ready?
Red Ferrari is not ready!

Sanfoundry Global Education & Learning Series – 1000 C++ Programs.

If you wish to look at all C++ Programming examples, go to C++ Programs.

« Prev - C++ Program to Implement a Class with Mutable Members

» Next - Copy Constructor Program in C++

Related Posts:

Recommended Articles: