CS253: Software Development with C++

Spring 2020

HW 0

CS253 HW0: Light Bulb Joke                

Purpose                

The purpose of this assignment is to make sure that you can follow instructions, login to a Linux system, compile a C++ program, and check in homework. This way, you’re sure that your login and password work before you need them for homework #1. This assignment is not optional.                 

Description                

In this assignment, you will write a program called hw0. It will answer the question, “How many CU students does it take to change a light bulb?”                 

Where’s the GUI?                

In this class, we build software using cmake and make. We turn in a tar file. You don’t really need to know much about any of those programs—we supply a file CMakeLists.txt that is the data file for cmake, which produces a a file Makefile, the data file for make. All that you need to do is type cmake . once, and make every time afterwards. make will compile your code (if it can) and create an hw0.tar file for you to turn in when you’re finished.                 

“Yeah, but where’s the GUI? How do I edit my code?” Edit it any way you want. Use of a GUI or text editor is not required in this class. If you need help using a text editor, come to me for help.                 

Sample Build                

In the following example, what you type looks like this. The percent sign, “%”, is my shell prompt. My CMakeLists.txt is shown as an example. You may copy it verbatim, or create your own, as long as it meets the requirements below.                 

    % cat CMakeLists.txt
    cmake_minimum_required(VERSION 3.14)

    # Using -Wall is required:
    add_compile_options(-Wall)

    # These compile flags are highly recommended, but not required:
    add_compile_options(-Wextra -Wpedantic)

    # Optional super-strict mode:
    add_compile_options(-fmessage-length=80 -fno-diagnostics-show-option)
    add_compile_options(-fstack-protector-all -g -O3 -std=c++14 -Walloc-zero)
    add_compile_options(-Walloca -Wctor-dtor-privacy -Wduplicated-cond)
    add_compile_options(-Wduplicated-branches -Werror -Wfatal-errors -Winit-self)
    add_compile_options(-Wlogical-op -Wold-style-cast -Wshadow)
    add_compile_options(-Wunused-const-variable=1 -Wzero-as-null-pointer-constant)

    # add_compile_options must be BEFORE add_executable.

    # Create the executable hw0 from the source file main.cc:
    add_executable(hw0 main.cc)

    # Create a tar file every time:
    add_custom_target(hw0.tar ALL COMMAND tar cf hw0.tar main.cc CMakeLists.txt)
    % cmake .
    … cmake output appears here …
    % make
    … make output appears here …
    % ./hw0
    Three—one to hold the light bulb and two to debate
    whether an LED or a CFL bulb harms the environment more!

Testing                

It is essential that you test what you’ve turned in (the hw0.tar file). Here’s an easy way, where % is my prompt:                 

    % rm -rf testdir
    % mkdir testdir
    % cd testdir
    % tar -xvf ../hw0.tar
    % cmake .
    % make
    % ./hw0
    % cd ..

That’s how the TA will test your program (though they will use a different directory name & location). If this doesn’t compile your program, then you get NO points.                 

Debugging                

If you encounter “STACK FRAME LINK OVERFLOW”, then try this:

    export STACK_FRAME_LINK_OVERRIDE=ffff-ad921d60486366258809553a3db49a4a

Requirements                

How to submit your homework:                

Use web checkin, or Linux checkin:                 

    ~cs253/bin/checkin HW0 hw0.tar

How to receive negative points:                

Turn in someone else’s work.