CMPT 225 Lab 0: Good morning, Good afternoon, and Good night!

In this lab we will write a simple C++ program.

What to submit?

A hello.cpp file (with this exact file name) that takes an hour in the list of arguments and greets the user with "Good morning", "Good afternoon", or "Good night" without the quotes and go to the next line.

The input hour will be in 24 hour clock system (6:00pm will be given as 18:00). 5:00 - 11:59 is considered morning; 12:00 - 18:59 is considered afternoon; and 19:00 - 4:59 is considered night.

The file should run as follows:

uname@hostname:~$ g++ -o hello_world hello.cpp
uname@hostname:~$ ./hello_world 9:00
Good morning
uname@hostname:~$ ./hello_world  11
Good morning
uname@hostname:~$ ./hello_world  12:00
Good afternoon
uname@hostname:~$ ./hello_world  12:10
Good afternoon
uname@hostname:~$ ./hello_world  18
Good afternoon
uname@hostname:~$ ./hello_world  22:10
Good night
uname@hostname:~$ ./hello_world  3:30
Good night
uname@hostname:~$ ./hello_world  5
Good morning

Make sure the output is as expected before you submit your code.

Where to submit?

In CourSys under CMPT 225 Lab0 activity.

Some instructions on creating your file on a CSIL machine

All C++ programs start their execution at the main function. This is similar to Java, though different in that the C++ main function is not contained in a class. Here is a set of instructions to create a very simple main function that prints Hello world!.

• You should be logged onto Ubuntu.

• Open a terminal window. To do so, click on the "Applications" menu located on the top left of the desktop, and select its "Utilities" option, then the "Terminal" option.

• At the command line, type pwd (print working directory) to see which directory you're in. In the following examples, the string ending in ~$ is assumed to be the command line prompt, and should not be typed.

  uname@hostname:~$ pwd
  /home/uname
  

• Change directory to your sfuhome. Files stored here will be stored permanently and available if you log in to another machine.

  uname@hostname:~$ cd sfuhome

• Make a directory for CMPT 225 in which you will store all your CMPT 225 work (labs and assignments) throughtout the semester. For example, call it cmpt-225.

  uname@hostname:~$ mkdir cmpt-225
  

• Change directory to your cmpt-225.

  uname@hostname:~$ cd cmpt-225

• Make a directory for the files for this lab, for example, call it Lab0.

  uname@hostname:~$ mkdir Lab0
  

• Change to this directory using cd (change directory):

  uname@hostname:~$ cd Lab0

• Open an editor such as "Sublime Text", which can be opened at the command prompt ("subl &") or from the "Applications" then "Programming" menu options. You could also use "vim", "gedit", "jedit", "emacs" or any other text editor.

• Copy the following code into the editor:

  #include <iostream>
  using namespace std;
  
  int main (void) {
      cout << "Hello world!";
      return 0;
  }
  

• Save this to a file called hello.cpp in your Lab0 directory.

• Type ls (list) to see the contents of the current directory. hello.cpp should appear:

  uname@hostname:~$ ls
  hello.cpp