Hello Project
COP-3223H

emacs hello.c

Hand-type yourself do not use copy-and-paste the following C program that prints "hello, world!\n". Remember this is case sensitive and don't forget the \n (backslash n).

#include <stdio.h>

int main(int argc, char **argv) {
  printf("hello, world!\n");
}

Then save and exit (for emacs, Ctrl-x Ctrl-s then Ctrl-x Ctrl-c).

Compile your program like this:

gcc -o hello hello.c

Then run your program like this:

./hello

You should see the following output.

hello, world!

exit

(or Ctrl-D on the empty command prompt.)

scriptreplay hello.timing hello.script 2

Wait and watch a recording of your terminal session play. The 2 is optional and will replay it at 2x speed. You can use a higher number as well to replay faster. Use Ctrl-C to stop playback early.

Enter

git add hello.c
git commit hello.c

Write an appropriate commit message. Remember that you will need to save (Ctrl-x Ctrl-s) then quit (Ctrl-x Ctrl-c) the emacs editor that pops up. If you are having trouble, be sure that you have completed the git project first.

Then enter

git add hello.timing hello.script
git commit hello.timing hello.script

Enter an appropriate commit message.

Double-check that you have no uncommitted changes to hello.c.

git status

Do not commit the backup file hello.c~ nor the hello program.

You should see something like this:

On branch master
Your branch is ahead of 'submission/master' by 2 commits.
  (use "git push" to publish your local commits)

Untracked files:
  (use "git add <file>..." to include in what will be committed)
        hello

nothing added to commit but untracked files present (use "git add" to track)

This means you have commits that haven't been pushed to the git server ("Your branch is ahead…") and that your working tree has no differences from your committed code ("nothing to commit…").

It's good practice to omit generated, binary files from source version control, such as your hello program binary. Source version control tools are geared towards source code, program binaries dramatically increase the size of the repository, and the program binary should be easily buildable from source.

You can ignore the hello program and emacs backup files by creating and committing a file called .gitignore, i.e., type in bash

echo -e "hello\n*~" > .gitignore
git add .gitignore
git commit .gitignore

Then type an appropriate commit message and exit the editor.

Type

git status

and you should now see

On branch master
Your branch is ahead of 'submission/master' by 3 commits.
  (use "git push" to publish your local commits)

nothing to commit, working tree clean

At this point, your working tree (where you are editing files) has no uncommitted changes, but the remote repo (where the instructor can access your repo) does not have your local commits yet. To push those changes type

git push

You should see something like

Welcome to eustis.eecs.ucf.edu.

Please use your NID and NID password to log in.

See http://t.cs.ucf.edu/help/eustis  for additional instructions.

Enumerating objects: 14, done.
Counting objects: 100% (14/14), done.
Delta compression using up to 8 threads
Compressing objects: 100% (11/11), done.
Writing objects: 100% (13/13), 2.69 KiB | 1.35 MiB/s, done.
Total 13 (delta 1), reused 0 (delta 0), pack-reused 0
To eustis3.eecs.ucf.edu:cop3223/NID/assignments
   c048012..99b2200  master -> master

If you have already run the self-check, you can remove it like this

rm -rf ~/tmp/assignments_selfcheck

Double-check the path carefully to avoid deleting the wrong directory.

git clone gitolite3@eustis3.eecs.ucf.edu:cop3223/$USER/assignments ~/tmp/assignments_selfcheck

You should see something like

Cloning into '/home/net/NID/tmp/assignments_selfcheck'...

Welcome to eustis.eecs.ucf.edu.

Please use your NID and NID password to log in.

See http://t.cs.ucf.edu/help/eustis  for additional instructions.

remote: Enumerating objects: 16, done.
remote: Counting objects: 100% (16/16), done.
remote: Compressing objects: 100% (12/12), done.
remote: Total 16 (delta 1), reused 0 (delta 0), pack-reused 0
Receiving objects: 100% (16/16), done.
Resolving deltas: 100% (1/1), done.

If you see

fatal: destination path '/home/net/NID/tmp/assignments_selfcheck already exists and is not an empty directory.

then remove the previous self-check.

ls -a

You should see the required files (hello.c, hello.script, hello.timing, and optionally .gitignore), ., .., and (optionally) a README.md file, e.g.,

.
..
hello.c
hello.script
hello.timing
.gitignore

The order does not matter. If you have a README.md, that is okay. If you have hello or any other program binary, remove it with these instructions and rerun the self-check.

You can also validate what files are actually in the entire repo like this:

git ls-tree --full-tree -r --name-only HEAD

gcc -o hello hello.c
./hello

This should output hello, world! (and exactly this; caps and the newline matter) on its own line, i.e.,

hello, world!

If you see a missing "\n", which will have the command-prompt immediately after the text, e.g.,

hello, world!NID:~/cop3402fall25/hello$ 

or if you see a missing comma, missing exclamation point, any capitalized letters, go back and follow the directions closely.

scriptreplay hello.timing hello.script 2

You should see a recording of yourself opening emacs, entering the hello world program, saving, and exiting.