Copy Constructor Program in C++

This C++ program illustrates copy-constructor in a class. A copy constructor is a special constructor for a class that is used to make a copy of an existing instance of the class. A copy-constructor looks like a constructor with an object of same class as an argument.

Here is the source code of the C++ program which illustrates copy-constructor 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 illustrate copy-constructor in a class

```
 */
```
```
#include <iostream>
```
```
using namespace std;
```
```
 
```
```
class Base {
```
```
    int i;
```
```
    public:
```
```
        Base(int ii = 0): i(ii) { }
```
```
        Base(const Base& b)
```
```
        {
```
```
            this->i = b.i;
```
```
        }
```

        void setData(int ii) { i = ii; }

```
        int getData() { return i; }
```
```
};
```
```
 
```
```
int main()
```
```
{
```
```
    Base b;
```
```
 
```

    cout << "b::getData = " << b.getData() << endl;

```
    cout << "b::setData = 10" << endl;
```
```
    b.setData(10);
```

    cout << "b::getData = " << b.getData() << endl;

    cout << "Calling copy-constructor on c" << endl;

```
    Base c(b);
```

    cout << "c::getData = " << c.getData() << endl;

```
}
```

$ a.out
b::getData = 0
b::setData = 10
b::getData = 10
Calling copy-constructor on c
c::getData = 10

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