Question

So here’s my question in the function declaration there is an argument and it is already initialized to a certain value. What are the procedures to call this function and use that default value, or is it just a way to document code, telling other programmers what you expect them to use as a value for the parameter? Thank you.

enum File
{
    XML = 0,
    PDF = 1,
};

Char *SetSection(const File = XML);

Answer 1

If I understand your question correctly, simply calling SetSection with no parameters will do.

SetSection();

The above call gets translated (for lack of a better term) to:

SetSection(XML);