CS60 Homework 7
---------------------------

Due: Wed. Oct 15 at 1:00pm

For homework 7, the task of the program is to read in a sentence from
the user and then make use of a recursive function for printing the
sentence in reverse.  For example, if the user inputted the following
(fictitious) sentence:

weirdo. a is teacher the though even science computer of history the in
course greatest the is CS60

The program should print out:

CS60 is the greatest course in the history of computer science even
though the teacher is a weirdo.

The program MUST make use of a recursive function (function that
recursively calls itself during execution) in order to perform this
task.


Turnin
-------------------

The turnin tag for this assignment is 'hw7' and must include the code,
a typescript showing the compilation (with gcc options '-ansi
-pedantic') without warnings and the program running with the above
sentence (you may replace the adjective 'greatest' with whichever you
like, without fear of losing points :).

Helpful Hints
-------------------

- The recursive function does not need to REARRANGE the string, it must
  simply print out the string in reverse as it runs.

- you can use fgets() (see the manpage) to read a string from the
  user, you may assume an input string of 256 characters or less:

	fgets(buf, 256, stdin);

- you can use strchr() (see manpage) to locate a char in a string

- you can assume every word is separated by a single space

- you can modify the input string during the computation for proper
  execution (insert '\0' characters, remove '\n' character, etc)

- read the K&R book on pointer arithmetic.  You can do something like this:

char *a, *b;
a = (char *)malloc(sizeof(char)*32);
b = a + 1;

- Now 'b' points to the chunk of memory starting at a[1] (31 chars).


Sample Output:
-----------------------------

[nurmi@localhost hw7]$ gcc hw7.c; ./a.out 
Enter your sentence to reverse: weirdo. a is teacher the though even science computer of history the in course greatest the is CS60
Forward: weirdo. a is teacher the though even science computer of history the in course greatest the is CS60

Backward: CS60 is the greatest course in the history of computer science even though the teacher is a weirdo. 
[nurmi@localhost hw7]$