UART Baud Rate Validation

#include <iostream>

class UARTDriver {
private:
    int baud_rate;

public:
    UARTDriver() : baud_rate(9600) {}

    void setBaudRate(int req) {
        switch (req) {
            case 9600:
            case 19200:
            case 115200:
                baud_rate = req;
                break;
            default:
                // Invalid request: retain previous valid state
                break;
        }
    }

    int getBaudRate() const {
        return baud_rate;
    }
};

int main() {
    int N;
    if (!(std::cin >> N)) return 0;

    UARTDriver driver;

    for (int i = 0; i < N; ++i) {
        int req;
        std::cin >> req;

        driver.setBaudRate(req);

        std::cout << "Active: " << driver.getBaudRate() << std::endl;
    }

    return 0;
}

Solving Approach