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It must ask the user for a filename.

It must open and read a file with the provided name, with $.$txt$$ appended to it$.$ For

example, if the user provides the file name $$tree$,$ the program must open and read

the file $$tree$.$txt$.$

The file must contain a textual description of a binary decision tree as in the

example above.

This file must specify a tree of your own design. It is suggested to design a tree on a

topic you like, or a hobby, or something you are interested in and are knowledgeable

about.

The tree must have at least five question nodes; there is no upper limit$.$

After reading the file, the program must walk the user through the tree until a

decision is reached.

The program must use at least one function, which should read the provided file and

return a tree. This function must be present in a separate file. The prototype of this

function should be:

vector readtree$($ifstream &$)$;

The function argument is an input file stream; the function assumes that the file was

already opened successfully, so it can start reading from the stream directly.

A header file must be provided.