Difference between Concrete Class and Abstract Class in C++

This C++ program differentiates between the concrete and abstract class. An abstract class is meant to be used as a base class where some or all functions are declared purely virtual and hence can not be instantiated. A concrete class is an ordinary class which has no purely virtual functions and hence can be instantiated.

Here is the source code of the C++ program which differentiates between the concrete and abstract class. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C++ Program to differentiate between concrete class and abstract class

```
 */	
```
```
#include <iostream>
```
```
#include <string>
```
```
using namespace std;
```
```
 
```
```
class Abstract {
```
```
    private:
```
```
        string info;
```
```
    public:
```

        virtual void printContent() = 0;

```
};
```
```
 
```
```
class Concrete {
```
```
    private:
```
```
        string info;
```
```
    public:
```

        Concrete(string s) : info(s) { }

```
        void printContent() {
```

            cout << "Concrete Object Information\n" << info << endl;

```
        }
```
```
};
```
```
 
```
```
int main()
```
```
{
```
```
    /*
```
```
     * Abstract a;
```

     * Error : Abstract Instance Creation Failed

```
     */
```
```
    string s;
```
```
 
```

    s = "Object Creation Date : 23:26 PM 15 Dec 2013";

```
    Concrete c(s);
```
```
    c. printContent();
```
```
}
```

$ a.out
Concrete Object Information
Object Creation Date : 23:26 PM 15 Dec 2013

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