How to define Interface, so called pure virtual function in Cpp

Implements pure virtual function in Interface

class IFTemperature {
public:
    virtual ~IFTemperature() = default;

    virtual double getTemperature() const = 0;
    virtual void setTemperature(double temp) = 0;
    virtual void display() const = 0;
};

Inherit the virtual class

#include <iostream>
#include <stdexcept>

class Celsius : public IFTemperature {
private:
    double temperature;
    static constexpr double MIN_TEMP = -273.15;
    static constexpr double MAX_TEMP = 1.4e32;

public:
    Celsius(double temp = 0.0) {
        setTemperature(temp);
    }

    double getTemperature() const override {
        return temperature;
    }

    void setTemperature(double temp) override {
        if (temp < MIN_TEMP || temp > MAX_TEMP) {
            throw std::out_of_range("Temperature out of range for Celsius.");
        }
        temperature = temp;
    }

    void display() const override {
        std::cout << "Temperature: " << temperature << " °C" << std::endl;
    }
};

class Fahrenheit : public IFTemperature {
private:
    double temperature;
    static constexpr double MIN_TEMP = -459.67;
    static constexpr double MAX_TEMP = 2.5e32;
public:
    Fahrenheit(double temp = 32.0) {
        setTemperature(temp);
    }

    double getTemperature() const override {
        return temperature;
    }

    void setTemperature(double temp) override {
        if (temp < MIN_TEMP || temp > MAX_TEMP) {
            throw std::out_of_range("Temperature out of range for Fahrenheit.");
        }
        temperature = temp;
    }

    void display() const override {
        std::cout << "Temperature: " << temperature << " °F" << std::endl;
    }
};

Usage

#include <memory>  // shared_ptr

int main() {
    try {

        std::shared_ptr<IFTemperature> tempC = std::make_shared<Celsius>(25.0);
        std::shared_ptr<IFTemperature> tempF = std::make_shared<Fahrenheit>(77.0);

        tempC->display();  // "Temperature: 25 °C"
        tempF->display();  // "Temperature: 77 °F"

        tempC->setTemperature(30.0);
        tempF->setTemperature(86.0);

        tempC->display();  // "Temperature: 30 °C"
        tempF->display();  // "Temperature: 86 °F"

        // throw exception
        tempC->setTemperature(-300.0);
    }
    catch (const std::out_of_range& e) {
        std::cerr << "Error: " << e.what() << std::endl;
    }

    return 0;
}