Someone help me understand this question

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C++

Hello. Okay i have this assignment, This is the question and my approach:
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Consider the following declaration of a Temperature class. The class holds information on high
and low temperature values. A constructor assigns initial values to the two private data members
highTemp and lowTemp. The updateTemp function takes a new data value and determines if one of
the temperature values in the object should be updated. If the value marks a new low, then lowTemp
is updated. Similarly a new high would change highTemp. The access functions getHightTemp() and
getLowTemp() returns the high and low temperature respectively.

Class Temperature
{
private:
float highTemp, lowTemp;
public:
//constructor
Temperature(float h, float l)
//update low and high temperatures.
Void updateTemp(float temp);
//access functions
float getHighTemp();
float getLowTemp();
};

Required:
i) Implement the constructor of the Temperature class as an external function.
ii) Implement the member function updateTemp().
iii) Implement the access functions getHighTemp() and getLowTemp()
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What I have tried:

#include <iostream>
using namespace std;
class Temperature{
    private:
        float HighTemp, LowTemp;
    public:
        Temperature(float h, float l);

        void updateTemp();

        float getHighTemp(float h){
            return HighTemp;
        }

        float getLowTemp(float l){
            return LowTemp;
        }

        float setHighTemp(float h){
            HighTemp=h;
        }

        float setLowTemp(float l){
            LowTemp=l;
        }
};

Temperature::Temperature(float h, float l){
        setHighTemp(h);
        setLowTemp(l);
}
void updateTemp(float temp){
//I'm stuck here
}
int main()
{
//i unno what to do}