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Exercise Space Age from PR #37 (author gvrooyen) (#147)
The 11 exercises in PR #37 have been stuck in limbo since last year. They were mostly complete except for the description tags and some minor changes to match the track convention. This PR just includes the update work.
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‎bin/check-exercise.sh‎

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die () { echo "$*" >&2; exit 1; }
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expected_number_of_tests () {
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num_tests=$(grep -c "description = " "${exercise_path}/.meta/tests.toml")
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ignored_tests=$(grep -c "include = false" "${exercise_path}/.meta/tests.toml")
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num_tests="0"
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ignored_tests="0"
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if [ -f "${exercise_path}/.meta/tests.toml" ]; then
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num_tests=$(grep -c "description = " "${exercise_path}/.meta/tests.toml")
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ignored_tests=$(grep -c "include = false" "${exercise_path}/.meta/tests.toml")
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fi
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echo $(( num_tests - ignored_tests ))
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}
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‎config.json‎

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"prerequisites": [],
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"difficulty": 2
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},
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{
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"slug": "space-age",
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"name": "Space Age",
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"uuid": "031f2fe0-e8b1-48c2-8ce3-f9ab8b76423c",
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"practices": [],
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"prerequisites": [],
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"difficulty": 1
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},
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{
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"slug": "triangle",
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"name": "Triangle",

‎exercises/practice/space-age/.docs/instructions.md‎

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# Instructions
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Given an age in seconds, calculate how old someone would be on a planet in our Solar System.
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One Earth year equals 365.25 Earth days, or 31,557,600 seconds.
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If you were told someone was 1,000,000,000 seconds old, their age would be 31.69 Earth-years.
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For the other planets, you have to account for their orbital period in Earth Years:
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| Planet | Orbital period in Earth Years |
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| ------- | ----------------------------- |
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| Mercury | 0.2408467 |
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| Venus | 0.61519726 |
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| Earth | 1.0 |
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| Mars | 1.8808158 |
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| Jupiter | 11.862615 |
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| Saturn | 29.447498 |
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| Uranus | 84.016846 |
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| Neptune | 164.79132 |
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~~~~exercism/note
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The actual length of one complete orbit of the Earth around the sun is closer to 365.256 days (1 sidereal year).
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The Gregorian calendar has, on average, 365.2425 days.
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While not entirely accurate, 365.25 is the value used in this exercise.
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See [Year on Wikipedia][year] for more ways to measure a year.
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[year]: https://en.wikipedia.org/wiki/Year#Summary
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~~~~

‎exercises/practice/space-age/.docs/introduction.md‎

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# Introduction
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The year is 2525 and you've just embarked on a journey to visit all planets in the Solar System (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune).
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The first stop is Mercury, where customs require you to fill out a form (bureaucracy is apparently _not_ Earth-specific).
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As you hand over the form to the customs officer, they scrutinize it and frown.
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"Do you _really_ expect me to believe you're just 50 years old?
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You must be closer to 200 years old!"
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Amused, you wait for the customs officer to start laughing, but they appear to be dead serious.
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You realize that you've entered your age in _Earth years_, but the officer expected it in _Mercury years_!
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As Mercury's orbital period around the sun is significantly shorter than Earth, you're actually a lot older in Mercury years.
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After some quick calculations, you're able to provide your age in Mercury Years.
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The customs officer smiles, satisfied, and waves you through.
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You make a mental note to pre-calculate your planet-specific age _before_ future customs checks, to avoid such mix-ups.
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~~~~exercism/note
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If you're wondering why Pluto didn't make the cut, go watch [this YouTube video][pluto-video].
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[pluto-video]: https://www.youtube.com/watch?v=Z_2gbGXzFbs
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~~~~

‎exercises/practice/space-age/.meta/config.json‎

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{
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"authors": [
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"gvrooyen"
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],
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"contributors": [
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"rmonnet"
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],
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"files": {
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"solution": [
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"space_age.odin"
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],
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"test": [
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"space_age_test.odin"
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],
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"example": [
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".meta/example.odin"
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]
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},
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"blurb": "Given an age in seconds, calculate how old someone is in terms of a given planet's solar years.",
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"source": "Partially inspired by Chapter 1 in Chris Pine's online Learn to Program tutorial.",
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"source_url": "https://pine.fm/LearnToProgram/?Chapter=01"
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}

‎exercises/practice/space-age/.meta/example.odin‎

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package space_age
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Planet :: enum {
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Mercury,
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Venus,
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Earth,
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Mars,
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Jupiter,
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Saturn,
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Uranus,
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Neptune,
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}
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seconds_per_earth_year :: 31_557_600
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age :: proc(planet: Planet, seconds: int) -> f64 {
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return f64(seconds) / seconds_per_earth_year / period(planet)
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}
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period :: proc(p: Planet) -> f64 {
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period: f64
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switch p {
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case .Mercury:
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period = 0.2408467
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case .Venus:
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period = 0.61519726
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case .Earth:
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period = 1.0
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case .Mars:
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period = 1.8808158
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case .Jupiter:
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period = 11.862615
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case .Saturn:
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period = 29.447498
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case .Uranus:
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period = 84.016846
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case .Neptune:
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period = 164.79132
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}
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return period
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}

‎exercises/practice/space-age/.meta/tests.toml‎

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# This is an auto-generated file.
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#
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# Regenerating this file via `configlet sync` will:
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# - Recreate every `description` key/value pair
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# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
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# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
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# - Preserve any other key/value pair
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#
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# As user-added comments (using the # character) will be removed when this file
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# is regenerated, comments can be added via a `comment` key.
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[84f609af-5a91-4d68-90a3-9e32d8a5cd34]
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description = "age on Earth"
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[ca20c4e9-6054-458c-9312-79679ffab40b]
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description = "age on Mercury"
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[502c6529-fd1b-41d3-8fab-65e03082b024]
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description = "age on Venus"
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[9ceadf5e-a0d5-4388-9d40-2c459227ceb8]
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description = "age on Mars"
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[42927dc3-fe5e-4f76-a5b5-f737fc19bcde]
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description = "age on Jupiter"
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[8469b332-7837-4ada-b27c-00ee043ebcad]
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description = "age on Saturn"
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[999354c1-76f8-4bb5-a672-f317b6436743]
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description = "age on Uranus"
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[80096d30-a0d4-4449-903e-a381178355d8]
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description = "age on Neptune"
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[57b96e2a-1178-40b7-b34d-f3c9c34e4bf4]
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description = "invalid planet causes error"
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include = false

‎exercises/practice/space-age/space_age.odin‎

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package space_age
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Planet :: enum {
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Mercury,
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Venus,
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Earth,
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Mars,
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Jupiter,
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Saturn,
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Uranus,
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Neptune,
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}
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age :: proc(planet: Planet, seconds: int) -> f64 {
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// Implement the procedure.
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return 0.0
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}

‎exercises/practice/space-age/space_age_test.odin‎

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package space_age
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import "base:intrinsics"
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import "core:log"
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import "core:testing"
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expect_almost :: proc(
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value, expected: $T,
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tolerance := 0.01,
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loc := #caller_location,
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) -> bool where intrinsics.type_is_float(T) {
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ok := abs(expected - value) <= tolerance
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// Instead of using testing.expect...(), you can also fail a test
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// by logging an error.
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if !ok {
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log.errorf("expected %.2f, got %.2f", expected, value, location = loc)
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}
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return ok
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}
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@(test)
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/// description = age on Earth
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test_age_on_earth :: proc(t: ^testing.T) {
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expect_almost(age(.Earth, 1_000_000_000), 31.69)
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}
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@(test)
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/// description = age on Mercury
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test_age_on_mercury :: proc(t: ^testing.T) {
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expect_almost(age(.Mercury, 2_134_835_688), 280.88)
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}
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@(test)
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/// description = age on Venus
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test_age_on_venus :: proc(t: ^testing.T) {
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expect_almost(age(.Venus, 189_839_836), 9.78)
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}
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@(test)
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/// description = age on Mars
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test_age_on_mars :: proc(t: ^testing.T) {
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expect_almost(age(.Mars, 2_129_871_239), 35.88)
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}
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@(test)
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/// description = age on Jupiter
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test_age_on_jupiter :: proc(t: ^testing.T) {
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expect_almost(age(.Jupiter, 901_876_382), 2.41)
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}
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@(test)
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/// description = age on Saturn
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test_age_on_saturn :: proc(t: ^testing.T) {
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expect_almost(age(.Saturn, 2_000_000_000), 2.15)
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}
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@(test)
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/// description = age on Uranus
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test_age_on_uranus :: proc(t: ^testing.T) {
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expect_almost(age(.Uranus, 1_210_123_456), 0.46)
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}
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@(test)
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/// description = age on Neptune
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test_age_on_neptune :: proc(t: ^testing.T) {
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expect_almost(age(.Neptune, 1_821_023_456), 0.35)
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}

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