Skip to main content Link Search Menu Expand Document (external link)
COMP251

Programming Kata 1

If you have not done so yet already, clone your portfolio on lily.

$ git clone <your-portfolio-url>

Change your working directory to inside the portfolio and create a new branch for this assignment.

$ cd <your-portfolio-directory>
$ git checkout -b <your-branch-name>

You must work within branches! Do not commit code to the main branch – if you do this, you will be penalized points. We are trying to model best practices in this class and develop some process skills that you will use in all future classes.

Now, create a subdirectory for this exercise and change your working directory to inside it.

$ mkdir exercise01
$ cd exercise01

Now create your C file and start coding!

$ vim read_and_reverse.c

Assignment

Write a program that repeatedly reads stings from standard input and then uses a function to reverse a string. You can have a termination condition and check it using strcmp, or you can just use CTRL-C to quit.

$ gcc read_and_reverse.c -o read_and_reverse
$ ./read_and_reverse
Enter a word (ctrl-C to quit): hello
hello -> olleh
Enter a word (ctrl-C to quit): world
world -> dlrow
Enter a word (ctrl-C to quit): racecar
racecar -> racecar
Enter a word (ctrl-C to quit): mom
mom -> mom
Enter a word (ctrl-C to quit): wow
wow -> wow
Enter a word (ctrl-C to quit): COMP251
COMP251 -> 152PMOC
Enter a word (ctrl-C to quit): ^C
$

Tips

  • You can assume that the string that the user enters is less than 50 characters.
  • Use strlen to determine the length of the word the user input (you will need to #include <string.h>.
  • In a shell, type $ man strlen for info about the function.
  • You can either use scanf to fgets to read string input.

Turning it in

When you are complete, commit your code and create a pull request with your exercise.

Change to the root directory of your repository:

$ cd ..

Add a line to the .gitignore file to exclude your binary.

$ echo exercise01/read_and_reverse >> .gitignore

Add the new directory (and file) to your staged commit and verify your files are staged.

$ git add exercise01   
$ git status

Commit your code and push it to GitHub!

$ git commit -m "<your commit message>"
$ git push -u origin <your-branch>

There will be a link to create a pull request in the upload message. Click the link and create a PR. Add me as reviewer.