Alva Program Designation C + +

#include<conio.h>
#include<iostream.h>
#include<math.h>

// Fajar Hudy Pratama

int pangkat ( int bil_dasar, int bil_pangkat )
{
if ( bil_pangkat==0 ) return ( 1 ); //jika pangkat 0, hasilnya 1
else return ( pangkat( bil_dasar , bil_pangkat-1 )*bil_dasar );
}

int main(){

const float phi =3.14159265;

float hasil,hasile;
int n1,n2,b,a,c,alva;
cout<<"Masukkan b    : ";cin>>b;
cout<<"Masukkan c    : ";cin>>c;
cout<<"Masukkan Alva : ";cin>>alva;

n1 = pangkat (b , 2);
n2 = pangkat (c , 2);

hasil = (n1) + (n2) - (2*b*c) - (cos (alva*phi/180));
hasile = hasil*hasil;

//Fajar Hudy Pratama
cout<<"\n";
cout<<"Hasil ???^2 = b^2 + c^2 - 2*b*c - cos alva\n";
cout<<"      ???^2 = "<<b<<"^2 + "<<c<<"^2 - 2*"<<b<<"*"<<c<<" - cos "<<alva<<endl;
cout<<"      ???^2 = "<<hasile;

getch();

}