no 5

Program menghitung keliling lingkaran

#include <cstdlib>
#include <iostream>
using namespace std;
void kel(int r){
 int hasil,phi;
 phi=3,14;
 hasil=2*phi*r;
 cout<<"Keliling lingkaran : "<<hasil<<endl;
}
int main(int argc, char *argv[])
{
 int r;
 cout<<"|=============================|\n";
 cout<<"| Program Menghitung Keliling |\n";
 cout<<"|          Lingkaran          |\n";
 cout<<"|=============================|\n";
 cout<<"Masukkan jari-jari : ";cin>>r;
 kel(r);
 system("pause");
 return 0;
}