PROGRAM C++ MENGHITUNG KELILING DAN LUAS LINGKARAN

//program :
#include <iostream.h>
#include <conio.h>

void main ()
        {
      clrscr();
      cout<<"========================================================== \n";
      cout<<"*******<< MENGHITUNG KELILING DAN LUAS LINGKARAN >>******* \n";
      cout<<"========================================================== \n";
      cout<<"                                                           \n";
        const float phi =3.14;
        int r;
        float keliling, luas;
        cout<<"Masukan Jari-Jari Lingkaran: ";
        cin>>r;
        keliling =2*phi*r;
      luas =phi*r*r;
      cout<<"---------------------------------------------------------- \n";
      cout<<"                                                           \n";
      cout<<"Keliling Lingkaran Adalah: "<<keliling<<endl;
      cout<<"                                                           \n";
      cout<<"Luas Lingkaran Adalah: "<<luas<<endl;
      cout<<"                                                           \n";
      cout<<"========================================================== \n";
      cout<<"**************<< Riyanto - 14.02.8728 >>****************** \n";
      cout<<"========================================================== \n";
      getch();
      }

//output :