Submit your work through the Canvas link.

Educational goals of this lab - verify that every student can

• write sentinel logic
• manipulate strings and lists
• use a counter and an accumulator

• It is common in word processing to count the words and characters in a group of lines. You've probably used it in Word to make sure your essay was long enough.
• The program should accept any number of words on the line of input, delimited by whitespace. Any number of whitespace characters should be treated as one delimiter. See the Strings II slides about "split without an argument".
• Note that a "word" is just something surrounded by whitespace. It is NOT just words from the dictionary. As you can see from the sample runs below, any character is allowed as input.
• The program counts the number of words and finds the average length of the words. You will need the split method and len function to count the words. Note that it is NOT sufficient to take the length of each string input and add them together. That would count the whitespace also!
• Accept input from the user until they press just the enter key by itself. This is your sentinel. Remember input returns an empty string when the user just presses Enter.
• To find the total length of all the words in a list, you MUST access them one at a time, no function will give your their total length with one call.
  Example: a list like ["the","green", "house"] has a length of 3 (not 13!). To find the length of all the words, you have to process the list elements one at a time, total = 0, total = 0 + 3 = 3, total = 3 + 5 = 8, total = 8 + 5 = 13.
• To find an average you need an accumulator and a counter. Make sure your code never divides by zero. Format your average to 2 places.

• Sample output

  Enter a line of words, press Enter to stop: the cat in the hat
  Enter a line of words, press Enter to stop: Hi there 12345 9
  Enter a line of words, press Enter to stop: &&&
  Enter a line of words, press Enter to stop:
  There were 10 words
  Average word length 3.00
  

• Another Sample Output

  Enter a line of words, press Enter to stop:
  There were 0 words
  Average word length 0.00
  

• Another Sample Output

  Enter a line of words, press Enter to stop: 13 15 17 19
  Enter a line of words, press Enter to stop: the end of the execution
  Enter a line of words, press Enter to stop:
  There were 9 words
  Average word length 3.11
  

• Another Sample output

  Enter a line of words, press Enter to stop: apple
  Enter a line of words, press Enter to stop: ball
  Enter a line of words, press Enter to stop: cat
  Enter a line of words, press Enter to stop: dog
  Enter a line of words, press Enter to stop: egg
  Enter a line of words, press Enter to stop: furniture
  Enter a line of words, press Enter to stop:
  There were 6 words
  Average word length 4.50
  

(18 points) Test cases

• Fill these out before you write the program! As usual, put them in a comment at the bottom of your program file. Use a calculator to figure these. In the Lines input column, the commas represent pressing the Enter key, the Enter also represents pressing the Enter key.

  Case #	Description	Lines Input	Expected Outcome
  		Input Lines	Number of words	Avg word length
  1.	One line, one word	bottle, Enter
  2.	One line, multiple words	Cat in the hat, Enter
  3.	Multiple Lines one word per line	the, largest, score, Enter
  4.	Multiple Lines multiple words per line	This is a test, only a test, of the Alert system, Enter
  5.	NO lines, just Enter	Enter

(10 points) Design

• As usual, 3 P's for your program!
• There are (at least) two different ways to design this program. It's your call which you do. DOCUMENT your choice!
  1. Process the strings of input as you get them. In the sentinel logic loop, just do the splitting of the string and counting and totalling right then. You don't need to store the original input string after that. When the loop is finished (the user hits Enter), you are ready to output results and calculate the average.
  2. Accumulate the strings of input into one big string in the sentinel logic loop. After the loop is finished (the user hits Enter), you can do one split and another loop to traverse the list that split generated.
• Another design decision is which kind of traversal you will do, either the "for item in list" or "for i in range(len(list))" Either will work here.

(42 points) Implementation

• Implement your design as a program.
• Make sure you run your test cases so you know it is giving the correct answers!
• Submit your finished program with the Canvas link.