Want to see if your friends are logged on to the network?
who -- will list the current users of your machine
rwho -- will list the current users of any machine on the network

Read: D&D, pp. 276-296, , pp. 320-??? (through 5.6)

Exercises: Pp. 317-318, #4.32.  For this exercise, you may assume the function you are writing (testPalindrome) takes three arguments: a character array, the index of the front pointer you are testing, and an index of the back pointer you are testing.  You should also write a main program.  This program should read in a line of text from the terminal (you may assume the line is less than 80 characters).  It should then strip out all of the white space (copying the original string into another array), and then call testPalindrome passing in the new string, 0 (as the front pointer), and the index of the last character in the array (as the back pointer). It should then print whether or not the input line is a palindrome.

1. Double subscripted arrays

2. Searching Arrays -- linear and binary search. 
3. Fun with searching and passing arrays: recursive binary search, and recursively printing out a character string in reverse