Lab - Arrays and Strings in C

Introduction

In this lab you will gain more C programming experience while developing functions that work with arrays and character strings.
You may work on your local machine (if you have Unix installed) or on one of the department's Unix machines (tanner).
In your systems directory, create another directory called strings. Change your current directory to ~/systems/strings.

Lab Steps

Part 0 - Download arraystrings.c

In your systems directory, create another directory called strings. Change your current directory to ~/systems/strings.
Download the file arraystrings.c on your local machine and then transfer it to your ~/systems/strings directory on tanner. (Alternately, you may view, copy and paste it directly to a file of the same name on tanner, using emacs.)
- To transfer arraystrings.c from your Windows machine to tanner, use the file transfer feature of SSH Secure Shell. Note that you'll need to run Secure File Transfer client, not the secure shell client (they are both part of the ssh package you installed at the beginning of the semester.) The interface is similar:
  - Select File > Connect, then type in the name of the remote machine (tanner.csc.villanova.edu) and your username. Leave the port number (22) unchanged. Accept the settings by clicking the Connect button.
  - If a host identification screen pops up, click Yes to accept the settings.
  - Enter your password and click OK.
  - Once you have logged in, you should see a two pane display. The pane on the left shows local files on your computer and on any network drive accessible to you on your computer. The pane on the right shows remote files on tanner. Double-click to change to a different directory, drag and drop to move files between the local machine and the remote machine.
- To transfer arraystrings.c from your Mac machine to tanner, use the secure file transfer protocol sftp. Open a terminal and change your current directory to the directory containing arraystrings.c. At the shell prompt invoke the command
```
    sftp username@tanner.csc.villanova.edu
```
  Enter your password. At the ftp prompt, enter the sequence of commands (one at a time)
```
    cd ~/systems/strings
    put arraystrings.c 
    bye
```

Part 1 - Average

Implement the functions "average" and "print_array".

Remember to use Ctrl-x Ctrl-s to save your file, Ctrl-x Ctrl-c to exit, and Ctrl-g to cancel a partially typed or accidental command. Save your code frequently.

Part 2 - Reverse

Implement the "reverse" function that reverses elements in an array.

Part 3 - Length

Implement the "length" function that returns the length of a string (character array) and the "print_string" function that prints out the string.

Part 4 - Compare

Implement the "compare" function that compares two strings for equality.

Part 5 - Copy

Implement the "copy" function that copies one string to another string.

Part 6 - Concatenate

Implement the "concat" function that concatenates two strings.