Assigned: 2016-01-11

Due: 2016-01-18

This is the Lab 1 assignment for ECE 1120 - C Programming for ECE.

The goals of this lab are to introduce you to the Cloud9 development environment, and the GitHub software hosting repository and use these tools to build and run a simple C program.

GitHub is Web-based source code repository service. That is, it lets users easily store and share source code - the ingredients that are used to build software.

To create an account, visit https://github.com. Use the same username that's associated with your GW email account. For example, if your GW email is [email protected], use the username "randomstudent".

Cloud9 is a web-based integrated development environment and Linux workspace. This lets you have your very own Linux system that you can use to edit, build, run, and test your software.

Once you have a GitHub account created, you can use that same account to sign up for a Cloud9 account. First, visit https://c9.io then click on the icon that lets you sign in with GitHub. Once you have logged in with your account, create a PRIVATE workspace called "work".

From the cloud9 command-line, use the git source code control tool to make a copy of the starter source code for this assignment.

randomstudent@work:~/workspace $ git clone https://github.com/gw-ece1120-s2016/lab01

You should see some output similar to this:

Cloning into 'lab01'...
remote: Counting objects: 4, done.
remote: Compressing objects: 100% (4/4), done.
remote: Total 4 (delta 0), reused 4 (delta 0), pack-reused 0
Unpacking objects: 100% (4/4), done.
Checking connectivity... done.

Go into the cloned lab01 directory (i.e. folder):

cd lab01

Build your first program from the source code by running "make":

randomstudent@work:~/workspace $ make

You should see some output similar to this:

cc -Wall    hello.c   -o hello

Finally run your first C program:

randomstudent@work:~/workspace $ ./hello
Hello world!

From the Cloud9 workspace menu on the left, navigate to hello.c source file. First, modify the comment to have your own name. Next, figure out how to add another print statement to your program so that it prints your name when it runs (on its own line), for example:

Hello world!
written by Random A. Student

After your program prints your name, you'll write some code to compute some simple math problems.

Add the following to your code (punctuation is very important):

/* This section computes a sum. */
int x, y, z;
x = 10;
y = 20;
z = x + y;
printf("x is %d, y is %d, and z is %d\n", x, y, z);

This code tells the computer to create three variables to hold integers. Then it sets the value of two of them to 10 and 20, and computes their sum and puts it into the third variable.

Finally, it prints out all three of them.

Now modify your program so it solves another math problem (without deleting anything in the previous sections). Create three variables to represent the height, width, and depth of a box. Write an expression to compute the volume of the box and print out the height, width, depth, and volume. Assume the height is 11, the depth is 14, and the width is 7. Add a comment to describe what this section of your code is doing.