CS368 – C++ for Java Programmers Assignment 1 solution


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Basics of C++ – MathLib
This assignment will focus on the basic operations of C++. You will create a math library from
basic principles using the basic C++ operators (+,-,/,%,type casting, etc). That means you should
not use any pre-built functions or libraries except where it is explicitly allowed. You can, of course,
use the functions in your library in the other functions of the library.
The library will be a c-style library, meaning a collection of functions (no classes).
The principal goal of this assignment is to (re)acquaint yourself with developing code in the *nix
environment. Your will submit your work to Gradescope and it will be both autograded and human
graded. The autograder will compile your code with g++-7.5.0.
Be sure to watch Piazza for any clarifications or updates to the assignment.
Don’t forget the Assignment 1 Canvas Quiz!
Your assignment submission is not complete without the quiz.
Your math library must consist of 2 files: MathLib.h and MathLib.cpp. The first being the header
file and the second being the implementation of the methods.
For MathLib.h:
• Be sure to have include guards.
• Don’t import anything that is unnecessary.
• Include file header comments that have your name, student id, a brief description of the library,
and be sure to cite any resource (site or person) that you used in implementing the library.
• Each function should have appropriate function header comments.
– You can use javadoc style (see doxygen) or another style, but be consistent.
– Be complete: good description of the function, parameters, and return values.
• For this assignment, no classes and no inline methods.
For MathLib.cpp:
• All the function bodies should be here.
• Don’t clutter your code with useless inline comments (it is a code smell [Inline Comments in
the Code is a Smell, but Document the Why], unless it is the why).
• Don’t use any pre-built functions.
• Follow normal programming practices for spacing, naming, etc: Be reasonable and consistent.
• Be sure to avoid redundant code.
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CS368 – C++ for Java Programmers Assignment 1 – Spring 2022
Functions to implement: 1
E absVal(E) This function should take a number and return the absolute value of that number,
where E is the data type. Your library should have an int, long, and double version.
long ceiling(double) This function returns the ceiling of the double parameter.
long floor(double) This function returns the floor of the double parameter.
long round(double, RoundingRule) This function will require you to define an enum datatype
called RoundingRule. The values in the enum are: ROUND_DOWN, ROUND_UP, ROUND_TO_ZERO,
ROUND_HALF_TO_EVEN, ROUND_HALF_TO_ODD. The default RoundingRule should be ROUND_HALF_UP.
This function will round the double parameter based on the RoundingRule as follows:
ROUND_DOWN (resp. UP) The floor (resp. ceiling) of the double.
ROUND_TO_ZERO (resp. AWAY_ZERO) Round to the integer closer to (resp. further from) zero.
ROUND_HALF_* Rounds to the nearest integer, e.g. 5.x becomes 5 when x < 0.5 and 6 when
x > 0.5, but requires a tie-breaker when x = 0.5. The tie-breaking being:
DOWN (resp. UP) Floor (resp. ceiling).
TO_ZERO (resp. AWAY_ZERO) Closer to (further from) zero.
TO_EVEN (resp. TO_ODD) Round to the nearest even (resp. odd) integer.
double pow(double, long) Raises the double value to the long exponent.
std::string toString(int num, unsigned int radix, bool) This function builds a std::string
representation of the int (first) parameter using the unsigned int (second) parameter as the
radix (i.e. numerical base). The string representation of the int will use the digits from 0 – 9
followed by a – z as needed. Negative numbers are prefixed with ’-’.
If the radix is greater than 36, return a string containing “Radix too large.”. The radix
should have a default value of 10.
The bool parameter indicates if the returned number contains lower case (true) or upper case
(false) letters. This only applies when the radix is less than 37. It should have a default
value of true.
Remember that this should be done without prebuilt functions like printf or streams.
int gcd(int, int) Return the greatest common divisor of the two parameters.
You must create a program (place it in demo.cpp) that demos all the functions in the library. There
is no fixed output required, but you demo.cpp requires:
• A main function.
• It must produce output (use the std::cout) that demos all the functions.
• There must at least 1 call to each of the functions described above for MathLib.h.
1Many of the functions involve rounding in some way: Wiki:Rounding may be a useful resource.
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CS368 – C++ for Java Programmers Assignment 1 – Spring 2022
Your submission must include a Makefile. The minimal requirements are:
• Compile using the demo executable with the make command.
• Use appropriate variables for the compiler and compiler options.
• It must contain a clean rule.
• The demo executable must be named something meaningful (not a.out).
Your submission must include a README.md file (see https://guides.github.com/features/masteringmarkdown/). The file should give a brief description of the program, the organization of the code,
how to compile the code, and how to run the program.
You will upload all the required files to Gradescope. The detail on how to do that will become
available to you once you have completed the Assignment 1 Canvas quiz.
There are no limits on the number of submissions. See the syllabus for the details about late
For this assignment, half of the marks will come from the autograder. For this assignment, none of
the test details have been hidden, but there may be hidden tests in future assignments.
The other half of the marks will come from human-grading of the submission. Your files will be
checked for style and to ensure that they meet the requirements described above. In addition, all
submitted files should contain a header (comments or otherwise) that, at a minimum, give a brief
description of the file, your name, and wisc id.
• Autograder Tests – 40
• DEMO – 10
– After completing step 4 (see below), come out to office hours and demo your working
environment to Marc or Ziyi. This should be done in the first two weeks!
• README File – 5
– Name / student id
– Typeset/organized with markdown
– Program description
– Compilation instructions
– Run instructions
– Code organization description
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CS368 – C++ for Java Programmers Assignment 1 – Spring 2022
• Makefile – 5
– File header comments including name/id
– Demo build rule with appropriate named executable
– MathLib.o build rule
– Clean build rule
– Correct file name
• demo.cpp – 4
– File header comments including name/id
– All library functions tested
• MathLib.h – 6
– File header comments including name/id
– Include guards
– All includes are required for header file
– Function header comments with function description, return value and parameters
– Comment detailing other elements like enums
– Function prototypes include default values as per the specification
– Only inline function bodies are defined in header
• MathLib.cpp – 10
– File header comments including name/id
– No unused/unneeded includes
– Consistent style (braces, spacing, etc)
– Avoid inline comments
– Avoid duplicate code
– Avoid c-style casting
– Avoid gotos
– Well-designed functions
Tackling Assignment 1
1. Figure out your coding environment. Since the autograder environment uses g++, it is highly
recommended to establish a similar environment.
2. Create a directory for your assignment 1 project, and create the required files: MathLib.cpp,
MathLib.h,demo.cpp, README.md, and Makefile.
3. Start small and make sure you have the basics down: implement the abs functions. Put the
function header details in MathLib.h, the function details in MathLib.cpp, some test calls in
demo.cpp, and set up your makefile.
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CS368 – C++ for Java Programmers Assignment 1 – Spring 2022
4. Test your abs functions in the autograder: For the autograder to compile, all the functions
must be defined. So, add the other function prototypes and enum definition to MathLib.h,
and add empty function bodies to MathLib.cpp. Then, submit to gradescope. (Pro tip: When
adding you function prototypes, also do the function header comment).
5. Demo your environment: Come out to Marc or Ziyi office hours to demo your coding
environment, and your autograder submission.
6. Implement and test the ceiling and floor functions. Do they call each other?
7. Implement and test the round function. Did you define the enum in MathLib.h? Did you
avoid duplicate code? Did you use calls to ceiling and floor?
8. Implement and test pow.
9. Implement and test toString.
10. Implement and test gcd.
11. Don’t forget to do the README.md file.
12. Final submission: make sure you have file comments, and name on all files. Double check the
rubric, and do your final submission to Gradescope.
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