Assignment 7: Peak, Sort, Inversion

Deadline

26 October 2021 (Tuesday 23:59 pm)

Prerequisite

• You are able to access the CS1010 programming environment.
• You are familiar with basic UNIX CLI and using terminal-based editor vim.
• You have gone through Exercise 0 and have already set up your .gitconfig.
• You are familiar with the steps of accepting, downloading, and submitting your exercise and assignment.
• You are familiar with the directory structure and the common files included in your assignment skeleton.
• You are comfortable writing simple C programs that involve arithmetic operations, long, double, and bool types, conditional if/else statements, loops, fixed sized arrays, and dynamically size arrays.
• You are comfortable breaking down a problem into smaller sub-problems which can be resolved using functions, including reusing existing functions written for other programs (with a tweak), writing a function that calls itself, designing what should the inputs and return values/types of a function.
• Be able to write C programs that are neat and readable, adhering to a common prescribed coding convention.
• Be comfortable writing C programs that use 2D arrays.
• Be able to write C comments that follows the Doxygen documentation format.

Learning Objectives

• Be comfortable studying properties in the input and apply them to efficiently solve problems.

Setup

• First, accept the assignment on GitHub
• Then, log in to one of the hosts of CS1010 programming environment and run

~cs1010/get-as07

• You should see the folder as07-<github username> in your home directory with the assignment skeleton inside.
• Inside that directory, you should see the following files:
  • peak.c, sort.c, and inversion.c are the most important files. They are the skeleton C code that you should edit to solve the assignment and the only files that you should change.
  • inputs and outputs are subdirectories that contain test inputs and test outputs. We use the same convention as Exercise 0 so you should already be familiar with them.
  • Makefile: This is the configuration for the tool make that we use to automate the compilation and testing of the programs.
  • test.sh: This is a bash script for testing your code.
  • compile_flags.txt: This file specifies the flags for compilation and is used by both make and clang-tidy.
  • Questions.md containing the description of the questions. This is a plain text file that you can view with vim, less, or other tools.

Solving The Assignments

• Edit the files peak.c, sort.c, and inversion.c to solve the corresponding question as described below.

• To compile and run tests with the sample inputs and outputs:

  make
  

  This command will compile all your C files with the appropriate settings and if there is no error, run the test scripts. If you pass the test cases, it will run clang-tidy to check if your code follows good code practices.

• The test cases are given in the inputs and outputs subdirectory. You can use cat or less to look at the content of these test cases. You can add more test cases or edit the given ones if needed.

• To compile individual program, type

  make <program>
  

  For instance, the command

  make echo
  

  compiles echo.c into echo without testing or running clang-tidy on it.

• To test individual program, run

  ./test.sh <program>
  

  For instance, the command

  ./test.sh echo
  

  tests echo without compiling or running clang-tidy on echo.c.

Submission

When you are ready, run the following command to submit:

~cs1010/submit-as07

The files peak.c, sort.c, and inversion.c will be uploaded to GitHub. You can submit multiple times, but only the last submission will be graded.

Manipulating Files on GitHub

Do not manipulate (e.g., edit) the files on GitHub or close the pull requests on GitHub. Doing so would interfere with the scripts and the grading/testing process of CS1010.

Identifying Yourself

In every C file that you submit to CS1010, you need to identify yourself by writing your name and tutorial group. Marks will be deducted if you fail to do so. You need to edit the line:

@author XXXX (Group YYYY)

and change it to something like:

@author Natasha Romanoff (Group B01)

Grading

This assignment contributes towards 3.5% of your final grade. The total marks for this assignment are 35 marks. For Programming Assignment 7,

• 1 mark is allocated to style. This is an almost free mark -- as long as the code is neat and readable, and adhere to CS1010 coding convention, you will get this 1 mark.

• 2 mark is allocated to documentation. Your code should following the good practices of breaking down your solution into small functions. Document each function following the Doxygen documentation format, as outlined here. Your code must have at least one non-trivial function (other than main()) that are properly documented to receive this mark.

• The rest of the marks are allocated to correctness and efficiency (combined) -- this includes the correctness of syntax, practices, approach, and logic, and whether you correctly follow our instructions. Note that even if your solution produces the correct output every time, it may not get full marks if the approach is wrong. Every question has an efficiency requirement in terms of big-O. You need to meet the given requirement.

Questions

To acclimatize you to the PE condition, the questions for this assignment is included in the skeleton instead, in a file named Questions.md.

You should learn how to use vim to open both the .c file and the Questions.md side-by-side (see https://nus-cs1010.github.io/2122-s1/vim.html#splitting-vims-viewport)