Write a function named wordStats that accepts as its parameter a string holding a file name, opens that file and reads its contents as a sequence of words, and produces a particular group of statistics about the input.
You should report the total number of words (as an integer), the average word length (as an un-rounded real number), and the number of unique letters used from A-Z, case-insensitively.
For example, suppose the file tobe.txt contains the following text:
To be or not TO BE, THAT IS the question.
For the purposes of this problem, we will use whitespace to separate words.
That means that some words include punctuation, as in "be,".
For the input above, your function should produce exactly the following output.
The number of "unique letters" is 12 because the file contains 12 distinct letters of the alphabet from A-Z: a, b, e, h, i, n, o, q, r, s, t, and u.
So the call of wordStats("tobe.txt"); would produce the following console output:
Total words = 10
Average length = 3.2
Unique letters = 12
If the input file does not exist or is not readable, your function should instead print the following output:
Error, bad input file.
Constraints:
Your solution should read the file only once, not make multiple passes over the file data.
