Assignment: #squares Due: 04/01/2017 Points: 5

Specification

Using a repetition control statement, query the user to enter in the length of the side of a square and then print a hollow square of that length using plus symbols in its corners, dashes across the top and bottom, vertical bars | down the sides, and space characters in the center. [Because of fonts many printed squares can look like rectangles.]

Your program should use the following prompt:

   Enter length between 0 and 64 (-1 to exit): _

If a length of -1 is entered, then terminate the query loop.

An error message should be issued when a length less than -1 or greater than 64 is entered.

Prior to printing a square, print the length entered.

Be sure your program knows how to print squares having lengths of 0, 1 and 2, respectively. [A square of length 0 should result in the printing of a blank line.]

Prior to terminating the program, print the number of squares printed and the average length.

Your program must use all three of the repetition control statements.

The following provides an example of how your program output should be formatted. User inputs are enclosed in brackets <>.

   Enter length between 0 and 64 (-1 to exit): <4>
   length entered:  4
   +--+
   |  |
   |  |
   +--+

   Enter length between 0 and 64 (-1 to exit): <0>
   length entered:  0


   Enter a length between 0 and 64 (-1 to  exit): <-2>
   length entered:  -2 is invalid
   Length must be between 0 and 64 inclusive, or enter -1 to exit.
   
   Enter a length between 0 and 64 (-1 to  exit): <1>
   length entered:  1
   +

   Enter a length between 0 and 64 (-1 to  exit): <2>
   length entered:  2
   ++
   ++

   Enter a length between 0 and 64 (-1 to  exit): <6>
   length entered: 6
   +----+
   |    |
   |    |
   |    |
   |    |
   +----+

   Enter a length between 0 and 64 (-1 to  exit): <-1>
   5 squares printed.  Average length: 2.6