Luas-Lingkaran(header iostream)

#include <iostream>
using namespace std;

int main()
{
    int r;
    float Luas, Pi;
    Pi = 3.14;
        cout << "Masukkan Nilai Jari,jari : ";
        cin >> r;
        Luas = Pi * r * r;
        cout << "Luas Lingkaran : " << Luas << "\n";
    return 0;
}