RESISTORS

#include <iostream>

using namespace std;

int main()
{
    cout << "This is a problem about calculating currents and voltages of resistors." << endl;
    cout << "First, give me the number of resistors." << endl;
    int n;
    cin >> n;

    cout << "Now, press 1 for in series connection or 2 for parallel connection."  << endl;
    int option;
    cin >> option;

    float matrix[n];
    float rwhole;
    float Vs;

    switch (option){

    case 1:

      rwhole=0;
      for (int i=0; i <n; i++){

       cout << "Give me the resistance of resistor " << (i+1) << " in Ohm:" <<endl;
       int r1;
       cin >> r1;
       matrix[i]= r1;
       rwhole+= matrix[i];
      }


      cout << "The whole resistance of the " << n << " resistors is: " << rwhole << " Ohm."<< endl << endl <<endl;

      cout << "Now, I will calculate the currents and voltages of the resistors." << endl;
      cout << "I want to tell me the voltage of battery-source." << endl;
      cin >> Vs;
      cout << "About current intensity: " << endl;
      cout << "I= " ;

      for (int j=0; j<n; j++){
        cout << "I" << (j+1) << " =";
      }

    cout << Vs/rwhole << " Amber(A)." << endl;
    cout << "About each resistor's voltage: " << endl;

    for(int z=0; z <n; z++){

        cout << "V" << (z+1) << "= "  << matrix[z]* Vs/ rwhole << " Volts(V)." << endl;
    }
    break;


    case 2:

    rwhole=0;
    for (int i=0; i <n; i++){

       cout << "Give me the resistance of resistor " << (i+1) << " in Ohm:" <<endl;
       int r1;
       cin >> r1;
       matrix[i]= r1;
       }

      int temp=0;
      for (int a=0; a<n; a++){

        temp+= 1/ matrix[a];
      }

      rwhole= 1/temp;
      cout << "The whole resistance of the " << n << " resistors is: " << rwhole << " Ohm."<< endl << endl <<endl;

      cout << "Now, I will calculate the currents and voltages of the resistors." << endl;
      cout << "I want to tell me the voltage of battery-source." << endl;
      cin >> Vs;

      cout << "About voltages: " << endl;
      cout << "V= " ;

      for (int j=0; j<n; j++){
        cout << "V" << (j+1) << " =";
      }

    cout << Vs << " Volts(V)." << endl;

    cout << "About each resistor's current intensity: " << endl;

    for(int z=0; z<n; z++){

        cout << "I" << (z+1) << "= "  << Vs/ matrix[z] << " Ambers(A)." << endl;
    }

    break;

    default:
    ;
    }

    return 0;
}