CS 160 - Programming Concepts and ApplicationsSummer II 2018 - Lab 1A - Hello World!Quick Links: Canvas | John Cabot | Piazza | zyBooks |
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This lab is due by Tuesday, July 3, 2018, 11:59 PM. The IDEThis lab teaches you how to create a
C++ program from scratch. Codenvy is an Integrated Development
Environment (IDE) designated to facilitate the development of software
solutions. Codenvy includes an editor, a compiler, a linker,
and many other additional tools to help programmers write high quality
software.
Depending on its complexity, a software project will have many
different files associated with it, such as the source code
(instructions written using a programming language), header files
(mostly definitions), resource files (images, sounds), data files, and
configuration files. Most IDEs, including Codenvy, require programmers
to organize all of these files into an entity called a project.
More complex software may be built from many inter-related projects
that are organized into a solution (a container for
projects). But, in our course this semester, we will only develop single-project
solutions.
Creating a C++ Empty Project
Now you may proceed to create your first C++ Codenvy project. How
exciting! On the right hand side, click "Create Project" (or navigate through the menus Workspace > Create project). Select "C++"
from the left hand menu. Then name it L1A and provide a brief description. Read
the next paragraph about file naming before moving on.
Let us now provide you with a few
important notes about names for projects, solutions, and development
files in general. Do not use spaces or any special characters when
naming your project. We highly recommend using short names (less than
10 characters). If you want to use more than one word, use underscores
to connect the words or appropriate use of upper/lower case (e.g.,
MyGame). Also, make sure your chosen name has a meaning so you can
remember what the project is later (e.g., L1A).
Editing A C++ Source Code FileIf you haven't already, be sure to click create.
You will already
have a
hello.cpp file that is started for you. We will want to rename it by right clicking and selecting "Rename...".
Name this file main.cpp. This file will contain our
program. Begin by deleting the default contents of the file.You can now start typing code. Sweet! Since this is a programming class, not a typing class, enter the code between the following lines with cut/paste:
/* CS 160 Lab 1A: XXXX (_GIVE_BRIEF_DESCRIPTION_HERE_)
*
* Author: XXXX (_INSERT_YOUR_NAME_HERE_)
*
* More complete description here...
*/
// The include section adds extra definitions from the C++ standard library.
#include <iostream> // For cin, cout, etc.
// We will (most of the time) use the standard library namespace in our programs.
using namespace std;
// Define any constants or global variables below this comment.
// Must have a function named "main", which is the starting point of a C++ program.
int main() {
/******** INSERT YOUR CODE BELOW HERE ********/
cout << "Hello world!" << endl; // print Hello world! to the screen
/******** INSERT YOUR CODE ABOVE HERE ********/
return 0; // signals the operating system that our program ended OK.
}
Next, edit all places where XXXX
appears in your main.cpp file with the appropriate information. When
you are done, you can save main.cpp by typing Ctrl+s.
Running your CodeThe easiest way to compile and execute
your project is to click the blue arrow button at the top menu bar and select "run". A new
tab should appear below with the following output:
command: cd /projects/L1A && make && ./a.out make: *** No targets specified and no makefile found. Stop. We need to add one more file to our folder. Download this file and then in Codenvy select "Project > Upload File" from the top menu bar and upload the file you just downloaded. Now press the blue run button again. Congratulations! You've written and
compiled your very first program! We will discuss what the building and linking
steps are doing very soon. Next, you'll see the new tab appear with the contents:
command: cd /projects/L1A && make && ./a.out [make]: Compiling main.o g++ -Wall -g -O3 -std=c++11 -c -o main.o main.cpp [make]: Linking a.out g++ -Wall -g -O3 -std=c++11 -o a.out main.o Hello world! Congratulations! You've run your very first program! The "Hello World" line is the
output of your program.
The Iterative ProcessNow that your program is running, we
are going to add two more output statements following the "Hello
world!" line. Add a second cout statement that prints
How are you?
Run your program again to verify you
are seeing the new output on the screen. Finally, add a third line to
print (note the spaces)
(I'm fine).
Run your program again. When you are
complete, your program should output
Hello world!
How are you? (I'm fine). You just went through a short
iterative process, or as programmer's say an incremental build. Once
you knew you had your program running properly, you made a small change
to the program and reran the program to verify the change was correct.
Once again, a small change was introduced to the code and the program
was run to verify the proper output. You should become very familiar
with this process as it will make future projects go smoother if you
make small changes at a time.
This lab taught you how to create a C++ Codenvy project from scratch and
output statements to the screen. You need to know how to create an
empty project from scratch. Thus, feel free to create a second new
empty project for grins (i.e., do this lab a second time when you start
Lab1B).
Optional Material: Details on the Codenvy InterfaceThe default interface can be described
in four sections: the menus, left pane, Code Window, and Output Window..
The menus have the same functionality
of most Microsoft Windows programs (e.g., Open File); there are,
however, menu items that are specific to programming.
The left pane has several different
views. You will almost always use the Project tab which is similar to
Windows Explorer. All of the code files associated with your projects
(i.e., program) will appear here.
The Code Window is where you will
type/edit your C++ programs. It works similar to a text editor with the
bonus of syntax coloring and segment grouping. You can have multiple
code windows open - they will stack as tabs at the top of the Code
Window. These tabs allow you to easily jump between multiple files when
editing. You can drag a tab to open to windows side by side for easy
viewing.
The Output Window keeps track of
information from the compiler. When you build your program (or code),
this window will list any problems that it found and give you tools to
help you find and fix those problems. If there were no errors building
your program, then the output from your program will appear in this
window.
Lab SubmissionYou will submit your solution to this lab with the rest of Set1. Detailed instructions for doing this are posted in Assignment 1. This lab is due by Tuesday, July 3, 2018, 11:59 PM. | |
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Last Updated: 07/01/18 22:03
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