### Solution of RLC circuits

For solving RLC circuits, we will need a header file math.h to be included.

Here is an example of how you can implement a solution for RLC series and parallel circuits using C++:

For the RLC series circuit, you can use the following code:

```
#include <iostream.h>
#include <math.h>
#include <conio.h>
void main() {
double R, L, C, f, w, Z, I, V;
clrscr();
cout << "Enter resistance (in ohms): ";
cin >> R;
cout << "Enter inductance (in henrys): ";
cin >> L;
cout << "Enter capacitance (in farads): ";
cin >> C;
cout << "Enter frequency (in Hz): ";
cin >> f;
w = 2 * M_PI * f;
Z = sqrt(pow(R, 2) + pow(w * L - 1 / (w * C), 2));
I = V / Z;
V = I * Z;
cout << "Impedance (in ohms): " << Z <<endl;
cout << "Current (in amps): " << I << endl;
cout << "Voltage (in volts): " << V << endl;
getch();
}
```

For RLC parallel circuit, you can use the following code:

```
#include <iostream.h>
#include <math.h>
#include <conio.h>
void main() {
double R, L, C, f, w, Z, I, V;
clrscr();
cout << "Enter resistance (in ohms): ";
cin >> R;
cout << "Enter inductance (in henrys): ";
cin >> L;
cout << "Enter capacitance (in farads): ";
cin >> C;
cout << "Enter frequency (in Hz): ";
cin >> f;
w = 2 * M_PI * f;
Z = 1 / (1 / R + w * C + 1 / (w * L));
I = V / Z;
V = I * Z;
cout << "Impedance (in ohms): " << Z <<endl;
cout << "Current (in amps): " << I << endl;
cout << "Voltage (in volts): " << V << endl;
getch();
}
```

Note: In the above code, M_PI is a constant defined in the cmath library for the value of pi. The code calculates the impedance (Z), current (I), and voltage (V) for an RLC circuit, given the values of resistance (R), inductance (L), capacitance (C), and frequency (f).

w in the code is the angular frequency of the AC signal in the RLC circuit. It is defined as w = 2 * M_PI * f, where f is the frequency of the AC signal in Hertz.

Angular frequency is a measure of the number of radians per second that a periodic wave completes in its cycle. In this code, it is used to calculate the impedance (Z) of the RLC circuit, which is a measure of the opposition that the circuit offers to the flow of AC current. The value of w is used in the calculation of impedance because impedance is frequency-dependent in an RLC circuit.