Asking for numbers using classes - c++

Question

The program should be like this:
1-ask for series and then parallel resistance (different classes)
2-pass Eq_R_Series and Eq_R_Paralel values(after they are calculated) to the Equivalent resistance that will calculate the Eq_R_Total
3-Display the Eq_R_Total.
so i need the main function and 3 classes(1 of the classes needs the info from the other 2).
class Serie
{
private:
int i, n = 4;
float R_Eq_S;
float r[4];
public:
float serie()
{
for (int i = 0; i < n; i++)
{
cout << "Resistence " << i + 1 << " ";
cin >> r[i];
R_Eq_S = R_Eq_S + r[i];
}
return R_Eq_S;
}
};
int main()
{
Serie s;
s.serie();
}
So i have the program with no errors now (doesn't mean theres nothing wrong), it runs and asks me to introduce the 1st resistence but after that it doesn't continue the cycle.
(i "just" need help to "link" the class to the main and the principal class.)
so this is my basic approach and it works but this is very limited, with a for i can change the number of resistance with one simple editing.
Thanks guys for the help even if it was just to point my mistakes ;) at least i think i'm learning
class Series
{
private:
float R1, R2, R3, R4;
public:
float R_Eq_S;
float series()
{
cout << "Resistance1= ";
cin >> R1;
cout << "Resistance2= ";
cin >> R2;
cout << "Resistance3= ";
cin >> R3;
cout << "Resistance4= ";
cin >> R4;
R_Eq_S = R1 + R2 + R3 + R4;
return R_Eq_S;
}
};
class Parallel{
private:
float R5, R6;
public:
float R_Eq_P;
float parallel(){
cout << "\nResistance5= ";
cin >> R5;
cout << "Resistance6= ";
cin >> R6;
R_Eq_P = (R5*R6) / (R5 + R6);
return R_Eq_P;
}
};
class Equivalent{
private:
float R_Eq;
public:
float r_eq()
{
Series s;
Parallel p;
R_Eq = s.series()+ p.parallel();
return R_Eq;
}
};
int main()
{
Equivalent r;
cout<<"\n\nR_Eq= "<<r.r_eq()<<endl;
}

Answer 1

#Tyler has pointed it in his comment. In your class definition r is declared as of type int. Then, in the expression r[i], i should be a pointer (this is usual C/C++ symmetry: a[i] is the same as *(a + i) so one of them should be dereferenceable, the other one being a number, but it does not matter much which one which). Your i is again an int nevertheless.
Second, I don't quite get how can your code compile, serie is a private method yet you call it outside of class's context.