solve eggs

Author: rootulp

rust/Cargo.toml

@@ -12,6 +12,7 @@ members = [
   "collatz-conjecture",
   "diffie-hellman",
   "difference-of-squares",
+  "eliuds-eggs",
   "gigasecond",
   "grade-school",
   "grains",

rust/eliuds-eggs/.exercism/config.json

@@ -0,0 +1,18 @@
+{
+  "authors": ["senekor"],
+  "files": {
+    "solution": [
+      "src/lib.rs",
+      "Cargo.toml"
+    ],
+    "test": [
+      "tests/eliuds-eggs.rs"
+    ],
+    "example": [
+      ".meta/example.rs"
+    ]
+  },
+  "blurb": "Help Eliud count the number of eggs in her chicken coop by counting the number of 1 bits in a binary representation.",
+  "source": "Christian Willner, Eric Willigers",
+  "source_url": "https://forum.exercism.org/t/new-exercise-suggestion-pop-count/7632/5"
+}

rust/eliuds-eggs/.exercism/metadata.json

@@ -0,0 +1 @@
+{"track":"rust","exercise":"eliuds-eggs","id":"8d2ea1113ec148b88c80a49b91373f2f","url":"https://exercism.org/tracks/rust/exercises/eliuds-eggs","handle":"rootulp","is_requester":true,"auto_approve":false}

rust/eliuds-eggs/.gitignore

@@ -0,0 +1,2 @@
+/target
+/Cargo.lock

rust/eliuds-eggs/Cargo.toml

@@ -0,0 +1,4 @@
+[package]
+edition = "2021"
+name = "eliuds_eggs"
+version = "1.0.0"

rust/eliuds-eggs/HELP.md

@@ -0,0 +1,86 @@
+# Help
+
+## Running the tests
+
+Execute the tests with:
+
+```bash
+$ cargo test
+```
+
+All but the first test have been ignored. After you get the first test to
+pass, open the tests source file which is located in the `tests` directory
+and remove the `#[ignore]` flag from the next test and get the tests to pass
+again. Each separate test is a function with `#[test]` flag above it.
+Continue, until you pass every test.
+
+If you wish to run _only ignored_ tests without editing the tests source file, use:
+
+```bash
+$ cargo test -- --ignored
+```
+
+If you are using Rust 1.51 or later, you can run _all_ tests with
+
+```bash
+$ cargo test -- --include-ignored
+```
+
+To run a specific test, for example `some_test`, you can use:
+
+```bash
+$ cargo test some_test
+```
+
+If the specific test is ignored, use:
+
+```bash
+$ cargo test some_test -- --ignored
+```
+
+To learn more about Rust tests refer to the online [test documentation][rust-tests].
+
+[rust-tests]: https://doc.rust-lang.org/book/ch11-02-running-tests.html
+
+## Submitting your solution
+
+You can submit your solution using the `exercism submit src/lib.rs Cargo.toml` command.
+This command will upload your solution to the Exercism website and print the solution page's URL.
+
+It's possible to submit an incomplete solution which allows you to:
+
+- See how others have completed the exercise
+- Request help from a mentor
+
+## Need to get help?
+
+If you'd like help solving the exercise, check the following pages:
+
+- The [Rust track's documentation](https://exercism.org/docs/tracks/rust)
+- The [Rust track's programming category on the forum](https://forum.exercism.org/c/programming/rust)
+- [Exercism's programming category on the forum](https://forum.exercism.org/c/programming/5)
+- The [Frequently Asked Questions](https://exercism.org/docs/using/faqs)
+
+Should those resources not suffice, you could submit your (incomplete) solution to request mentoring.
+
+## Rust Installation
+
+Refer to the [exercism help page][help-page] for Rust installation and learning
+resources.
+
+## Submitting the solution
+
+Generally you should submit all files in which you implemented your solution (`src/lib.rs` in most cases). If you are using any external crates, please consider submitting the `Cargo.toml` file. This will make the review process faster and clearer.
+
+## Feedback, Issues, Pull Requests
+
+The GitHub [track repository][github] is the home for all of the Rust exercises. If you have feedback about an exercise, or want to help implement new exercises, head over there and create an issue. Members of the rust track team are happy to help!
+
+If you want to know more about Exercism, take a look at the [contribution guide].
+
+## Submitting Incomplete Solutions
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.
+
+[help-page]: https://exercism.org/tracks/rust/learning
+[github]: https://github.com/exercism/rust
+[contribution guide]: https://exercism.org/docs/community/contributors

rust/eliuds-eggs/README.md

@@ -0,0 +1,71 @@
+# Eliud's Eggs
+
+Welcome to Eliud's Eggs on Exercism's Rust Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Introduction
+
+Your friend Eliud inherited a farm from her grandma Tigist.
+Her granny was an inventor and had a tendency to build things in an overly complicated manner.
+The chicken coop has a digital display showing an encoded number representing the positions of all eggs that could be picked up.
+
+Eliud is asking you to write a program that shows the actual number of eggs in the coop.
+
+The position information encoding is calculated as follows:
+
+1. Scan the potential egg-laying spots and mark down a `1` for an existing egg or a `0` for an empty spot.
+2. Convert the number from binary to decimal.
+3. Show the result on the display.
+
+Example 1:
+
+```text
+Chicken Coop:
+ _ _ _ _ _ _ _
+|E| |E|E| | |E|
+
+Resulting Binary:
+ 1 0 1 1 0 0 1
+
+Decimal number on the display:
+89
+
+Actual eggs in the coop:
+4
+```
+
+Example 2:
+
+```text
+Chicken Coop:
+ _ _ _ _ _ _ _ _
+| | | |E| | | | |
+
+Resulting Binary:
+ 0 0 0 1 0 0 0 0
+
+Decimal number on the display:
+16
+
+Actual eggs in the coop:
+1
+```
+
+## Instructions
+
+Your task is to count the number of 1 bits in the binary representation of a number.
+
+## Restrictions
+
+Keep your hands off that bit-count functionality provided by your standard library!
+Solve this one yourself using other basic tools instead.
+
+## Source
+
+### Created by
+
+- @senekor
+
+### Based on
+
+Christian Willner, Eric Willigers - https://forum.exercism.org/t/new-exercise-suggestion-pop-count/7632/5

rust/eliuds-eggs/src/lib.rs

@@ -0,0 +1,23 @@
+pub fn egg_count(decimal: u32) -> usize {
+    let binary = decimal_to_binary(decimal);
+    let eggs = count('1', binary);
+    eggs
+}
+
+fn decimal_to_binary(decimal: u32) -> String {
+    let mut result = "".to_string();
+
+    let mut n = decimal;
+    while n != 0 {
+        let remainder = n % 2;
+        n = n / 2;
+        let c = char::from_digit(remainder, 10).unwrap();
+        result.insert(0, c);
+    }
+
+    result
+}
+
+fn count(c: char, string: String) -> usize {
+    string.chars().filter(|char| *char == c).count()
+}

rust/eliuds-eggs/tests/eliuds-eggs.rs

@@ -0,0 +1,33 @@
+use eliuds_eggs::*;
+
+#[test]
+fn test_0_eggs() {
+    let input = 0;
+    let output = egg_count(input);
+    let expected = 0;
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn test_1_egg() {
+    let input = 16;
+    let output = egg_count(input);
+    let expected = 1;
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn test_4_eggs() {
+    let input = 89;
+    let output = egg_count(input);
+    let expected = 4;
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn test_13_eggs() {
+    let input = 2_000_000_000;
+    let output = egg_count(input);
+    let expected = 13;
+    assert_eq!(output, expected);
+}