In this lab, you will learn how to use the cygwin/gcc environment to write, compile, and run C programs.

Getting Started

(1) Start the cygwin bash shell. This is available from the Start menu on all of the computers in the KEC building. The full path in the menu is:

Start → All Programs → Cygwin → Cygwin Terminal

Once the cygwin bash shell has started, type the following commands, pressing the Enter key after each command:

cd h:
mkdir -p CS101
cd CS101

(2) Using a web browser, download CS101_Lab01.zip. Save the zip file in the CS101 directory within your home directory.

(3) Using Windows File Explorer, navigate to your CS101 directory on your H: drive and right click on the CS101_Lab01.zip file and select Extract All. This should create a subdirectory named CS101_Lab01 that contains the lab files.

NOTE: If there is another CS101_Lab01 subdirectory inside the CS101_Lab01 subdirectory, move the files to the outer CS101_Lab01 subdirectory and delete the inner one.

(4) In cygwin, navigate into the CS101_Lab01 directory containing the lab files:

cd CS101_Lab01

You will know you are in the correct subdirectory if the command

ls

shows the hello.cpp file (and others such as Makefile). IF it shows another CS101_Lab01 directory, refer to the note above in step 3.

(5) Start Notepad++.

On the KEC lab computers, Notepad++ is available from the Start menu:

Start → All Programs → Notepad++ → Notepad++

Once your text editor has started, choose File→Open from the menu, and open the file

hello.cpp

on your H: drive in the CS101 directory and CS101_Lab01 subdirectory.

Your Task

Your task is to add a main function to the hello.cpp file to accomplish the following tasks:

Print the message Hello, CS 101! to the output window
Prompt the user for their age in years. Store the value entered by the user in an int variable.
Print the message OK, you are N years old, where N is the integer value entered by the user.

Here is an example run (user input in bold):

Hello, CS 101!
How old are you? 36
OK, you are 36 years old

To compile the program (run the compiler to translate your C source code into an executable file), run the following command using the Cygwin bash shell:

make

If the compilation is successful, you should see something like the following output:

g++ -g -Wall   -c -o hello.o hello.cpp
g++ -o hello.exe hello.o

If you see a compiler error message, ask the instructor or lab coach for help.

Once the program is compiled, run the program by typing the following command in the Cygwin bash shell:

./hello.exe

IF you get an error message that the file is not found, ensure that you are in the correct directory and that there are no syntax errors in your source code.

Hints

Put #include <stdio.h> at the top of hello.cpp. This will allow your progam to use the printf and scanf functions.
Use the printf function to print output to the screen.
Declare an int variable to store the user’s age.
Use the scanf function to read the user’s age.

Submitting

When you are done, run the following command from the Cygwin bash shell:

make submit

You will be prompted for your Marmoset username and password, which you should have received by email. The entire submission process should produce output that looks something like the following:

$ make submit
Creating submit.properties file
Collecting the names of files to be submitted
Creating a solution zip file
updating: hello.cpp (deflated 4%)
updating: submitToMarmoset.pl (deflated 60%)
updating: Makefile (deflated 52%)
perl submitToMarmoset.pl solution.zip submit.properties
Enter your username: jstudent
Enter your password: 
######################################################################
              >>>>>>>> Successful submission! <<<<<<<<<

Make sure that you log into the marmoset server to manually
check that the files you submitted are correct.

Details:

         Semester:   Fall 2024
         Course:     CS 101
         Assignment: lab01

######################################################################

You will use your own username in place of “jstudent”. Note that when you type your password, it will not be echoed to the screen.