Program rangkaian listrik di Dev-C++

Berikut ini adalah cara mencari program rangkaian listrik dengan input dibawah ini;

#include <iostream>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */
using namespace std;

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

/*Dibaca tiga tahanan R1, R2 dan R3, kemudian tampilkan hambatan seri total (RS) atau hambatan paralel total (RP).
 jika input "1" maka tampilkan RS, jika input "2" maka tampilkan RP. jika tidak keduanya maka keluar program.*/

 int menu;
 float R1, R2, R3, RS, RP;
             
cout<<"===========================================\n";
cout<<"| <<<<<  Program Rangkaian Listrik  >>>>> |\n";
cout<<"===========================================\n\n";
cout<<"Pilihan : \n";
cout<<"1. Hitung hambatan seri total (RS) \n";
cout<<"2. Hitung hambatan paralel total (RP)\n";
cout<<"3. Not Found \n\n";
cout<<"Masukkan pilihan Anda [1/2/3 ?] : ";
cin>>menu;

switch(menu){
case 1:
cout<<"Masukkan nilai resistor 1 (R1) : ";
cin>>R1;
cout<<"\nMasukkan nilai resistor 2 (R2) : ";
cin>>R2;
cout<<"\nMasukkan nilai resistor 3 (R3) : ";
cin>>R3;
RS=R1+R2+R3;
cout<<"Hambatan seri total = "<<RS<<" ohm";
break;
case 2:
cout<<"Masukkan nilai resistor 1 (R1) : ";
cin>>R1;
cout<<"\nMasukkan nilai resistor 2 (R2) : ";
cin>>R2;
cout<<"\nMasukkan nilai resistor 3 (R3) : ";
cin>>R3;
RP=(1/(1/R1+1/R2+1/R3));
cout<<"Hambatan paralel total = "<<RP<<" ohm";
break;
case 3 :
cout<<"Not Found ";
break;
default:
cout<<" ";
break;
}
return 0;
}

maka nanti akan muncul output sbb;