Chama Foundation Normal Exam

Getting Started

• Fork this repository under your own account
• Clone the forked repository to your computer
• Create a .gitignore file so generated files won't be committed
• Commit your progress frequently and with descriptive commit messages
• All your answers and solutions should go in this repository

Keep in mind

• You can use any resource online, but please work individually

• Don't just copy-paste your answers and solutions, use your own words instead

• Don't push your work to GitHub until your mentor announces that the time is up

Exercises

Greatest values in matrices

Write a method which takes two matrices as parameters and returns a new matrix. The method should compare each element in the input matrices and fill the returned matrix with the greater values. You only have to deal with square matrices. A square matrix is a matrix with the same number of rows and columns.

Write 2 different test cases for the method.

Example 1

Input 1

[
  [2, 1],
  [0, 1]
]

Input 2

[
  [0, 3],
  [-1, 1]
]

Output

[
  [2, 3],
  [0, 1]
]

Example 2

Input 1

[
  [-1, 1, 0],
  [0, 1, 0],
  [0, 1, 0]
]

Input 2

[
  [0, 0, 0],
  [0, 1, 0],
  [0, 0, 0]
]

Output

[
  [0, 1, 0],
  [0, 1, 0],
  [0, 1, 0]
]

Word Frequency

Write a method which can read and parse a file. The method must take a frequency as a parameter and collects all of the words that appear in that amount of times in the source file. It shall write the selected words into output.txt.

If there is no word present with the given frequency it shall not do anything.

The method must be able to handle the case if the input file name does not exists.

Example

Example file can be found here.

Input frequency

2

The output.txt contains this line:

apple, pear, pirate

Zoo

You're going to model a Zoo with animals and workers and create some interactions between them.

Animal

• It has a name, an age, a gender and

  • a fedTimes meaning the number of times the animal got food

We should be able to create animals two ways:

• providing name, age, gender

• or only providing name, when age and gender will get default values 1 and "unknown" respectively

• It has an eat() method which only increases fedTimes.

• It has an isHungry() method which returns whether the animal is currently hungry.

• It has a toString() method which returns information about him/her in the format:

  • "name is a age years old gender animal and was fed fedTimes times"

Lion

• Lion is always hungry.

Monkey

• Monkey is randomly hungry.

Elephant

• Elephant is hungry in every second occasion when a Worker checks on them.

Worker

• It has a name and

  • an animalsToLookAfter list of containing the animals that they are looking after (we should be able to change this field later on)

We should be able to create workers two ways:

• providing name, animalsToLookAfter

• or only providing name, when the animalsToLookAfter list should be an empty list

It has a doDailyRoutine() method which:

• iterates through the worker's animalsToLookAfter list and feed them if it is necessary.

  • first, he/she calls the specific animal's isHungry() method

  • and if it returns true, then call the animal's eat() method.

Command line exercise

• Take a look at this directory structure:

homework
 |--math
 |   |--.git
 |   |--calculus
 |   |   |--jacobian_matrix.md
 |   |   └--exercises
 |   |       └--week01_hw.txt
 |   └--geometry
 |       |--week01_hw.txt
 |       └--pithagorean_theorem.md
 └--history
     |--.git
     |--taylor_polynomial.md
     |--history_of_rome.md
     └--history_of_greece.md

• Your task is to write commands in the correct order from the directory given below.

• Do it with less commands without chaining them together.

• Assume that the following files are currently in the staging area:

  • math/calculus/jacobian_matrix.md
  • math/geometry/pithagorean_theorem.md

• Your current directory is homework/

  1. Create an exercises directory in math/geometry/
  2. Move geometry/week01_hw.txt to math/geometry/exercises/
  3. Move history/taylor_polynomial.md to math/calculus/
  4. Remove math/geometry/pithagorean_theorem.md from the staging area
  5. Rename math/geometry/pithagorean_theorem.md to math/geometry/pythagorean_theorem.md
  6. Commit all the changes in the math/ folder

• Solution:

type your answer here

1 mkdir math/geometry/ 2 mv geometry/week01_hw.txt math/geometry/exercises/ 3 mv history/taylor_polynomial.md math/calculus 4 5 mv math/geometry/pithagorean_theorem.md math/geometry/pythagorean_theorem.md 6 git add . git commit -m "reorganising files"