Račun otpora by B-Matt

#include <iostream>
#include <windows.h>
using namespace std;

float R1, R2, R;
float t1, t2, alfa, R20;

float serija(float R1, float R2)
{
      R=R1+R2;
      return (R);
}

float paralela(float R1, float R2)
{
      R=(1/R1)+(1/R2);
      return (R);
}

float temp(float t1, float t2, float alfa, float R20)
{
      R=R20*(1+alfa*(t2-t1));
      return (R);
}

int main ()
{
    char acUserName[100];
    DWORD nUserName = sizeof(acUserName);
    int i, j;
    if(GetUserName(acUserName, &nUserName)) {
    cout << "Dobro dosao " << acUserName << "." << endl; }
    cout << "Koji otpor zelis racunati? (1 - u spojevima, 2 - ovisan o temp): ";
    cin >> j;
    switch(j)
    {
        case 1:
            cout << "Unesi koji je spoj (1 - serijski, 2 - paralelni): ";
            cin >> i;
            switch(i)
            {
                   case 1:
                        cout << "Unesi R1: ";
                        cin >> R1;
                        cout << "Unesi R2: ";
                        cin >> R2;
                        serija(R1, R2);
                        cout << "R: " << R << " oma" << endl;
                        break;
                   case 2:
                        cout << "Unesi R1: ";
                        cin >> R1;
                        cout << "Unesi R2: ";
                        cin >> R2;
                        paralela(R1, R2);
                        cout << "R: " << R << " oma" << endl;
                        break;
            }
            break;
        case 2:
             cout << "Unesi temperaturu t1: ";
             cin >> t1;
             cout << "Unesi temperaturu t2: ";
             cin >> t2;
             cout << "Unesi temperaturni koeficijent(alfa): ";
             cin >> alfa;
             temp(t1, t2, alfa, 20);
             cout << "R: " << R << " oma" << endl;
             break;
    }
    system("pause");
    return 0;
}