From 60b19a6bd429e6b1d6cf6ac12ea8a6714ae417e1 Mon Sep 17 00:00:00 2001 From: BethanyG Date: Wed, 27 Dec 2023 05:05:44 -0800 Subject: [PATCH] Synced practice exercise docs to problem specificatons. (#3573) --- .../perfect-numbers/.docs/instructions.md | 42 +++++++++++++------ .../phone-number/.docs/instructions.md | 6 ++- .../queen-attack/.docs/instructions.md | 20 ++++----- .../practice/rest-api/.docs/instructions.md | 2 +- 4 files changed, 42 insertions(+), 28 deletions(-) diff --git a/exercises/practice/perfect-numbers/.docs/instructions.md b/exercises/practice/perfect-numbers/.docs/instructions.md index 689a73c0..b2bc82ca 100644 --- a/exercises/practice/perfect-numbers/.docs/instructions.md +++ b/exercises/practice/perfect-numbers/.docs/instructions.md @@ -2,22 +2,38 @@ Determine if a number is perfect, abundant, or deficient based on Nicomachus' (60 - 120 CE) classification scheme for positive integers. -The Greek mathematician [Nicomachus][nicomachus] devised a classification scheme for positive integers, identifying each as belonging uniquely to the categories of **perfect**, **abundant**, or **deficient** based on their [aliquot sum][aliquot-sum]. -The aliquot sum is defined as the sum of the factors of a number not including the number itself. +The Greek mathematician [Nicomachus][nicomachus] devised a classification scheme for positive integers, identifying each as belonging uniquely to the categories of [perfect](#perfect), [abundant](#abundant), or [deficient](#deficient) based on their [aliquot sum][aliquot-sum]. +The _aliquot sum_ is defined as the sum of the factors of a number not including the number itself. For example, the aliquot sum of `15` is `1 + 3 + 5 = 9`. -- **Perfect**: aliquot sum = number - - 6 is a perfect number because (1 + 2 + 3) = 6 - - 28 is a perfect number because (1 + 2 + 4 + 7 + 14) = 28 -- **Abundant**: aliquot sum > number - - 12 is an abundant number because (1 + 2 + 3 + 4 + 6) = 16 - - 24 is an abundant number because (1 + 2 + 3 + 4 + 6 + 8 + 12) = 36 -- **Deficient**: aliquot sum < number - - 8 is a deficient number because (1 + 2 + 4) = 7 - - Prime numbers are deficient +## Perfect -Implement a way to determine whether a given number is **perfect**. -Depending on your language track, you may also need to implement a way to determine whether a given number is **abundant** or **deficient**. +A number is perfect when it equals its aliquot sum. +For example: + +- `6` is a perfect number because `1 + 2 + 3 = 6` +- `28` is a perfect number because `1 + 2 + 4 + 7 + 14 = 28` + +## Abundant + +A number is abundant when it is less than its aliquot sum. +For example: + +- `12` is an abundant number because `1 + 2 + 3 + 4 + 6 = 16` +- `24` is an abundant number because `1 + 2 + 3 + 4 + 6 + 8 + 12 = 36` + +## Deficient + +A number is deficient when it is greater than its aliquot sum. +For example: + +- `8` is a deficient number because `1 + 2 + 4 = 7` +- Prime numbers are deficient + +## Task + +Implement a way to determine whether a given number is [perfect](#perfect). +Depending on your language track, you may also need to implement a way to determine whether a given number is [abundant](#abundant) or [deficient](#deficient). [nicomachus]: https://en.wikipedia.org/wiki/Nicomachus [aliquot-sum]: https://en.wikipedia.org/wiki/Aliquot_sum diff --git a/exercises/practice/phone-number/.docs/instructions.md b/exercises/practice/phone-number/.docs/instructions.md index 6b86bbac..62ba48e9 100644 --- a/exercises/practice/phone-number/.docs/instructions.md +++ b/exercises/practice/phone-number/.docs/instructions.md @@ -11,12 +11,14 @@ The first three digits of the local number represent the _exchange code_, follow The format is usually represented as ```text -(NXX)-NXX-XXXX +NXX NXX-XXXX ``` where `N` is any digit from 2 through 9 and `X` is any digit from 0 through 9. -Your task is to clean up differently formatted telephone numbers by removing punctuation and the country code (1) if present. +Sometimes they also have the country code (represented as `1` or `+1`) prefixed. + +Your task is to clean up differently formatted telephone numbers by removing punctuation and the country code if present. For example, the inputs diff --git a/exercises/practice/queen-attack/.docs/instructions.md b/exercises/practice/queen-attack/.docs/instructions.md index ad7ea954..97f22a0a 100644 --- a/exercises/practice/queen-attack/.docs/instructions.md +++ b/exercises/practice/queen-attack/.docs/instructions.md @@ -8,18 +8,14 @@ A chessboard can be represented by an 8 by 8 array. So if you are told the white queen is at `c5` (zero-indexed at column 2, row 3) and the black queen at `f2` (zero-indexed at column 5, row 6), then you know that the set-up is like so: -```text - a b c d e f g h -8 _ _ _ _ _ _ _ _ 8 -7 _ _ _ _ _ _ _ _ 7 -6 _ _ _ _ _ _ _ _ 6 -5 _ _ W _ _ _ _ _ 5 -4 _ _ _ _ _ _ _ _ 4 -3 _ _ _ _ _ _ _ _ 3 -2 _ _ _ _ _ B _ _ 2 -1 _ _ _ _ _ _ _ _ 1 - a b c d e f g h -``` +![A chess board with two queens. Arrows emanating from the queen at c5 indicate possible directions of capture along file, rank and diagonal.](https://assets.exercism.org/images/exercises/queen-attack/queen-capture.svg) You are also able to answer whether the queens can attack each other. In this case, that answer would be yes, they can, because both pieces share a diagonal. + +## Credit + +The chessboard image was made by [habere-et-dispertire][habere-et-dispertire] using LaTeX and the [chessboard package][chessboard-package] by Ulrike Fischer. + +[habere-et-dispertire]: https://exercism.org/profiles/habere-et-dispertire +[chessboard-package]: https://github.com/u-fischer/chessboard diff --git a/exercises/practice/rest-api/.docs/instructions.md b/exercises/practice/rest-api/.docs/instructions.md index cb57f6f4..af223ba4 100644 --- a/exercises/practice/rest-api/.docs/instructions.md +++ b/exercises/practice/rest-api/.docs/instructions.md @@ -44,5 +44,5 @@ Your task is to implement a simple [RESTful API][restful-wikipedia] that receive [restful-wikipedia]: https://en.wikipedia.org/wiki/Representational_state_transfer [iou]: https://en.wikipedia.org/wiki/IOU [github-rest]: https://developer.github.com/v3/ -[reddit-rest]: https://www.reddit.com/dev/api/ +[reddit-rest]: https://web.archive.org/web/20231202231149/https://www.reddit.com/dev/api/ [restfulapi]: https://restfulapi.net/