Resistors

#include <iostream>

using namespace std;

int main()
{

   cout << "This is a problem about calculating the whole resistance of many resistors." << endl;
   cout << "First tell me the type of connection. Press 1 for in series connection or 2 for parallel connection." << endl;
   int option;
   cin >> option;


   cout << "Now give me how many resistors you want to connect in this type." << endl;
   int n;
   cin >> n;

   float rwhole=0;
   float c;

   switch(option){

     case 1:
     cout << "You chose in series connection." <<endl;

      for(int i=0; i<n; i++){
            cout << "Give the value (in Ohm) of resistor number" << i+1 << ":" <<endl;
            float r1;
            cin >> r1;
            rwhole+=r1;
                                }
     cout << "The whole resistance of the" << n << "resistors in series is: R=" << rwhole << " Ohm." << endl;
     break;


     case 2:
     cout << "You chose parallel connection." << endl;

       for (int j=0; j<n; j++){
             cout << "Give me the value (in Ohm) of resistor number" << j+1 << ":" << endl;
             float r2;
             cin >> r2;
             c+= 1/r2;
                                   }

       rwhole= 1/c;
       cout << "The whole resistance of the" << n << "resistors in parallel connection is: R=" << rwhole << " Ohm." << endl;
       break;


     default:
     cout << "No option for pressing " << option << "." << endl;
   }

   return 0;
}