C++ Program to find area of circle using constructor

Program

#include <iostream>
#define PI 3.141
using namespace std;
class AreaCircle
{
  private:
    float area;
  public:
    AreaCircle(float radius)
    {
        area = PI * radius * radius;
    }
    void display()
    {
        cout << "Area:\t" << area << endl;
    }
};
int main()
{
    cout << "Enter value of radius:\t";
    int radius;
    cin >> radius;
    AreaCircle area(radius);
    area.display();
    return 0;
}

Output

Enter value of radius:  3.4
Area:   28.269