Multilevel Driver Initialization

#include <iostream>
using namespace std;

// TODO 1: Create CoreDriver class
//         - Constructor prints "Core driver initialized"
class CoreDriver{
    public:
    CoreDriver(){
        printf("Core driver initialized\n");
    }
};
// TODO 2: Create CommDriver class
//         - Publicly inherits from CoreDriver
//         - Constructor prints "Comm driver initialized"
class CommDriver : public CoreDriver{
    public:
    CommDriver(){
        printf("Comm driver initialized\n");
    }
};
// TODO 3: Create SpiDriver class
//         - Publicly inherits from CommDriver
//         - Constructor takes int speed
//         - Prints "SPI driver initialized"
//         - Stores speed
//         - Function prints "SPI speed <speed>"
class SpiDriver : public CommDriver{
    int speed;
    public:
    SpiDriver(int speed) : speed(speed){
        printf("SPI driver initialized\n");
    }
    void print(){
        printf("SPI speed %d",speed);
    }
};
int main() {
    int speed;
    cin >> speed;

    // TODO 4: Create SpiDriver object
    SpiDriver s(speed);
    // TODO 5: Call function to print SPI speed
    s.print();
    return 0;
}