LUAS JARI-JARI

{#include <cstdlib>

#include <iostream>

using namespace std;

int main(int argc, char *argv[])

    int phi,r,hasil;

    phi = 3.14;

    cout << "masukan nilai r: "<<endl;

    cin >> r;

    hasil = 3*phi*r*r;

    cout << "hasil jari jari = "<<hasil<<"\n";   

    system("PAUSE");

    return EXIT_SUCCESS;