The definition for the set member function of the Temperature class:

PROGRAM CODE:

#include <stdexcept> // Include this header to use std::invalid_argument

class Temperature
{
public:
    void set(double new_degrees, char new_scale)
    {
        // Check if the scale is valid ('F' or 'C')
        if (new_scale != 'F' && new_scale != 'C')
        {
            throw std::invalid_argument("Invalid scale. Use 'F' for Fahrenheit or 'C' for Celsius.");
        }

        // Assign the new values to the member variables
        degrees = new_degrees;
        scale = new_scale;
    }

    double degrees;
    char scale; // 'F' for Fahrenheit or 'C' for Celsius.
};

• The set member function takes two arguments: new_degrees (a double representing the new temperature value) and new_scale (a char representing the scale, which can be either 'F' for Fahrenheit or 'C' for Celsius).
• In the set function, we first check if the provided scale is valid ('F' or 'C'). If it is not valid, we throw an exception using std::invalid_argument to indicate that an invalid scale was provided. Otherwise, we assign the new_degrees and new_scale values to the member variables degrees and scale, respectively.

This set member function allows you to set the temperature and its scale for an instance of the Temperature class. For example:

Temperature t;
t.set(75.0, 'F'); // Sets the temperature to 75.0 degrees Fahrenheit