luas dan isi

#include <iostream>
using namespace std;

const float phi = 3.14;

int main(){
    int jari_jari;
    float isi_jari, luas_jari;
    cout << "=============== MENGHITUNG LUAS DAN ISI LINGKARAN ================" << endl;
    cout << "# Masukkan Jari-Jari : "; cin >> jari_jari;
    isi_jari = 4 * phi * jari_jari;
    luas_jari = (4 * phi * jari_jari) / 3;
    cout << "# Isi Jari Jari : " << isi_jari << endl;
    cout << "# Luas Jari Jari : " << luas_jari << endl;
    return 0;
}