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{
"authors": [
"ee7"
],
"files": {
"solution": [
"luhn.zig"
],
"test": [
"test_luhn.zig"
],
"example": [
".meta/example.zig"
]
},
"blurb": "Given a number determine whether or not it is valid per the Luhn formula.",
"source": "The Luhn Algorithm on Wikipedia",
"source_url": "https://en.wikipedia.org/wiki/Luhn_algorithm"
}

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{"track":"zig","exercise":"luhn","id":"5c3683c495e143e98cf457b99607c9fb","url":"https://exercism.org/tracks/zig/exercises/luhn","handle":"Chomp1295","is_requester":true,"auto_approve":false}

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# Help
## Running the tests
Write your code in `<exercise_name>.zig`.
To run the tests for an exercise, run:
```bash
zig test test_exercise_name.zig
```
in the exercise's root directory (replacing `exercise_name` with the name of the exercise).
## Submitting your solution
You can submit your solution using the `exercism submit luhn.zig` 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 [Zig track's documentation](https://exercism.org/docs/tracks/zig)
- The [Zig track's programming category on the forum](https://forum.exercism.org/c/programming/zig)
- [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.
- [The Zig Programming Language Documentation][documentation] is a great overview of all of the language features that Zig provides to those who use it.
- [Zig Guide][zig-guide] is an excellent primer that explains the language features that Zig has to offer.
- [Ziglings][ziglings] is highly recommended.
Learn Zig by fixing tiny broken programs.
- [The Zig Programming Language Discord][discord-zig] is the main [Discord][discord].
It provides a great way to get in touch with the Zig community at large, and get some quick, direct help for any Zig related problem.
- [#zig][irc] on irc.freenode.net is the main Zig IRC channel.
- [/r/Zig][reddit] is the main Zig subreddit.
- [Stack Overflow][stack-overflow] can be used to discover code snippets and solutions to problems that may have already asked and maybe solved by others.
[discord]: https://discordapp.com
[discord-zig]: https://discord.com/invite/gxsFFjE
[documentation]: https://ziglang.org/documentation/master
[irc]: https://webchat.freenode.net/?channels=%23zig
[reddit]: https://www.reddit.com/r/Zig
[stack-overflow]: https://stackoverflow.com/questions/tagged/zig
[zig-guide]: https://zig.guide/
[ziglings]: https://codeberg.org/ziglings/exercises

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# Luhn
Welcome to Luhn on Exercism's Zig Track.
If you need help running the tests or submitting your code, check out `HELP.md`.
## Instructions
Given a number determine whether or not it is valid per the Luhn formula.
The [Luhn algorithm][luhn] is a simple checksum formula used to validate a variety of identification numbers, such as credit card numbers and Canadian Social Insurance Numbers.
The task is to check if a given string is valid.
## Validating a Number
Strings of length 1 or less are not valid.
Spaces are allowed in the input, but they should be stripped before checking.
All other non-digit characters are disallowed.
### Example 1: valid credit card number
```text
4539 3195 0343 6467
```
The first step of the Luhn algorithm is to double every second digit, starting from the right.
We will be doubling
```text
4_3_ 3_9_ 0_4_ 6_6_
```
If doubling the number results in a number greater than 9 then subtract 9 from the product.
The results of our doubling:
```text
8569 6195 0383 3437
```
Then sum all of the digits:
```text
8+5+6+9+6+1+9+5+0+3+8+3+3+4+3+7 = 80
```
If the sum is evenly divisible by 10, then the number is valid.
This number is valid!
### Example 2: invalid credit card number
```text
8273 1232 7352 0569
```
Double the second digits, starting from the right
```text
7253 2262 5312 0539
```
Sum the digits
```text
7+2+5+3+2+2+6+2+5+3+1+2+0+5+3+9 = 57
```
57 is not evenly divisible by 10, so this number is not valid.
[luhn]: https://en.wikipedia.org/wiki/Luhn_algorithm
## Source
### Created by
- @ee7
### Based on
The Luhn Algorithm on Wikipedia - https://en.wikipedia.org/wiki/Luhn_algorithm

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const std = @import("std");
const ascii = std.ascii;
pub fn isValid(s: []const u8) bool {
var idx: usize = s.len;
var luhn_idx: usize = 1;
var total: u64 = 0;
while (idx > 0) {
idx -= 1;
if (s[idx] == 32) continue;
if (!ascii.isDigit(s[idx])) {
return false;
}
var curr: u8 = s[idx] - 48;
if (luhn_idx % 2 == 0) {
curr *= 2;
if (curr > 9) {
curr -= 9;
}
}
total += curr;
luhn_idx += 1;
}
if (luhn_idx <= 2) return false;
return total % 10 == 0;
}

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const std = @import("std");
const testing = std.testing;
const isValid = @import("luhn.zig").isValid;
test "single digit strings cannot be valid" {
try testing.expect(!isValid("1"));
}
test "a single zero is invalid" {
try testing.expect(!isValid("0"));
}
test "a simple valid SIN that remains valid if reversed" {
try testing.expect(isValid("059"));
}
test "a simple valid SIN that becomes invalid if reversed" {
try testing.expect(isValid("59"));
}
test "a valid Canadian SIN" {
try testing.expect(isValid("055 444 285"));
}
test "invalid Canadian SIN" {
try testing.expect(!isValid("055 444 286"));
}
test "invalid credit card" {
try testing.expect(!isValid("8273 1232 7352 0569"));
}
test "invalid long number with an even remainder" {
try testing.expect(!isValid("1 2345 6789 1234 5678 9012"));
}
test "invalid long number with a remainder divisible by 5" {
try testing.expect(!isValid("1 2345 6789 1234 5678 9013"));
}
test "valid number with an even number of digits" {
try testing.expect(isValid("095 245 88"));
}
test "valid number with an odd number of spaces" {
try testing.expect(isValid("234 567 891 234"));
}
test "valid strings with a non-digit added at the end become invalid" {
try testing.expect(!isValid("059a"));
}
test "valid strings with punctuation included become invalid" {
try testing.expect(!isValid("055-444-285"));
}
test "valid strings with symbols included become invalid" {
try testing.expect(!isValid("055# 444$ 285"));
}
test "single zero with space is invalid" {
try testing.expect(!isValid(" 0"));
}
test "more than a single zero is valid" {
try testing.expect(isValid("0000 0"));
}
test "input digit 9 is correctly converted to output digit 9" {
try testing.expect(isValid("091"));
}
test "very long input is valid" {
try testing.expect(isValid("9999999999 9999999999 9999999999 9999999999"));
}
test "valid luhn with an odd number of digits and non zero first digit" {
try testing.expect(isValid("109"));
}
test "using ascii value for non-doubled non-digit isn't allowed" {
try testing.expect(!isValid("055b 444 285"));
}
test "using ascii value for doubled non-digit isn't allowed" {
try testing.expect(!isValid(":9"));
}
test "non-numeric, non-space char in the middle with a sum that's divisible by 10 isn't allowed" {
try testing.expect(!isValid("59%59"));
}

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{
"authors": [
"keiravillekode"
],
"files": {
"solution": [
"pig_latin.zig"
],
"test": [
"test_pig_latin.zig"
],
"example": [
".meta/example.zig"
]
},
"blurb": "Implement a program that translates from English to Pig Latin.",
"source": "The Pig Latin exercise at Test First Teaching by Ultrasaurus",
"source_url": "https://github.com/ultrasaurus/test-first-teaching/blob/master/learn_ruby/pig_latin/"
}

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{"track":"zig","exercise":"pig-latin","id":"d23f71cbaf584a0f98b05a1a255df945","url":"https://exercism.org/tracks/zig/exercises/pig-latin","handle":"Chomp1295","is_requester":true,"auto_approve":false}

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# Help
## Running the tests
Write your code in `<exercise_name>.zig`.
To run the tests for an exercise, run:
```bash
zig test test_exercise_name.zig
```
in the exercise's root directory (replacing `exercise_name` with the name of the exercise).
## Submitting your solution
You can submit your solution using the `exercism submit pig_latin.zig` 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 [Zig track's documentation](https://exercism.org/docs/tracks/zig)
- The [Zig track's programming category on the forum](https://forum.exercism.org/c/programming/zig)
- [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.
- [The Zig Programming Language Documentation][documentation] is a great overview of all of the language features that Zig provides to those who use it.
- [Zig Guide][zig-guide] is an excellent primer that explains the language features that Zig has to offer.
- [Ziglings][ziglings] is highly recommended.
Learn Zig by fixing tiny broken programs.
- [The Zig Programming Language Discord][discord-zig] is the main [Discord][discord].
It provides a great way to get in touch with the Zig community at large, and get some quick, direct help for any Zig related problem.
- [#zig][irc] on irc.freenode.net is the main Zig IRC channel.
- [/r/Zig][reddit] is the main Zig subreddit.
- [Stack Overflow][stack-overflow] can be used to discover code snippets and solutions to problems that may have already asked and maybe solved by others.
[discord]: https://discordapp.com
[discord-zig]: https://discord.com/invite/gxsFFjE
[documentation]: https://ziglang.org/documentation/master
[irc]: https://webchat.freenode.net/?channels=%23zig
[reddit]: https://www.reddit.com/r/Zig
[stack-overflow]: https://stackoverflow.com/questions/tagged/zig
[zig-guide]: https://zig.guide/
[ziglings]: https://codeberg.org/ziglings/exercises

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# Pig Latin
Welcome to Pig Latin on Exercism's Zig Track.
If you need help running the tests or submitting your code, check out `HELP.md`.
## Introduction
Your parents have challenged you and your sibling to a game of two-on-two basketball.
Confident they'll win, they let you score the first couple of points, but then start taking over the game.
Needing a little boost, you start speaking in [Pig Latin][pig-latin], which is a made-up children's language that's difficult for non-children to understand.
This will give you the edge to prevail over your parents!
[pig-latin]: https://en.wikipedia.org/wiki/Pig_latin
## Instructions
Your task is to translate text from English to Pig Latin.
The translation is defined using four rules, which look at the pattern of vowels and consonants at the beginning of a word.
These rules look at each word's use of vowels and consonants:
- vowels: the letters `a`, `e`, `i`, `o`, and `u`
- consonants: the other 21 letters of the English alphabet
## Rule 1
If a word begins with a vowel, or starts with `"xr"` or `"yt"`, add an `"ay"` sound to the end of the word.
For example:
- `"apple"` -> `"appleay"` (starts with vowel)
- `"xray"` -> `"xrayay"` (starts with `"xr"`)
- `"yttria"` -> `"yttriaay"` (starts with `"yt"`)
## Rule 2
If a word begins with one or more consonants, first move those consonants to the end of the word and then add an `"ay"` sound to the end of the word.
For example:
- `"pig"` -> `"igp"` -> `"igpay"` (starts with single consonant)
- `"chair"` -> `"airch"` -> `"airchay"` (starts with multiple consonants)
- `"thrush"` -> `"ushthr"` -> `"ushthray"` (starts with multiple consonants)
## Rule 3
If a word starts with zero or more consonants followed by `"qu"`, first move those consonants (if any) and the `"qu"` part to the end of the word, and then add an `"ay"` sound to the end of the word.
For example:
- `"quick"` -> `"ickqu"` -> `"ickquay"` (starts with `"qu"`, no preceding consonants)
- `"square"` -> `"aresqu"` -> `"aresquay"` (starts with one consonant followed by `"qu`")
## Rule 4
If a word starts with one or more consonants followed by `"y"`, first move the consonants preceding the `"y"`to the end of the word, and then add an `"ay"` sound to the end of the word.
Some examples:
- `"my"` -> `"ym"` -> `"ymay"` (starts with single consonant followed by `"y"`)
- `"rhythm"` -> `"ythmrh"` -> `"ythmrhay"` (starts with multiple consonants followed by `"y"`)
## Source
### Created by
- @keiravillekode
### Based on
The Pig Latin exercise at Test First Teaching by Ultrasaurus - https://github.com/ultrasaurus/test-first-teaching/blob/master/learn_ruby/pig_latin/

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const std = @import("std");
const mem = std.mem;
const rule1 = [_][]const u8{ "a", "e", "i", "o", "u", "xr", "yt", "ay" };
const vowels = "aeiou";
fn rule_one(res: *std.ArrayList(u8), phrase: []const u8) mem.Allocator.Error!bool {
for (rule1) |r| {
if (mem.eql(u8, r, &.{phrase[0]}) or mem.eql(u8, r, phrase[0..2])) {
try res.appendSlice("ay");
return true;
}
}
return false;
}
fn rule_two(res: *std.ArrayList(u8), phrase: []const u8) mem.Allocator.Error!bool {
for (0..phrase.len - 1) |i| {
if (!mem.containsAtLeast(u8, vowels, 1, &[_]u8{phrase[i]})) {
try res.appendSlice(&.{res.orderedRemove(mem.indexOf(u8, phrase, &[_]u8{phrase[0]}).?)});
} else {
try res.appendSlice("ay");
return true;
}
}
return false;
}
fn rule_three(res: *std.ArrayList(u8), phrase: []const u8) mem.Allocator.Error!bool {
var prev: u8 = 0;
for (0..phrase.len - 1) |i| {
if ((prev == 'q' and phrase[i] == 'u') or !mem.containsAtLeast(u8, vowels, 1, &[_]u8{phrase[i]})) {
try res.appendSlice(&.{res.orderedRemove(mem.indexOf(u8, phrase, &[_]u8{phrase[0]}).?)});
} else {
try res.appendSlice("ay");
return true;
}
prev = phrase[i];
}
return false;
}
// Because Yttrium Oxide ("yttria") comes up all the time in children's games
fn rule_four(res: *std.ArrayList(u8), phrase: []const u8) mem.Allocator.Error!bool {
var i: usize = 0;
while (phrase[i] != 'y' and i < phrase.len) : (i += 1) {
try res.appendSlice(&.{res.orderedRemove(mem.indexOf(u8, phrase, &[_]u8{phrase[0]}).?)});
}
try res.appendSlice("ay");
return true;
}
fn translate_single(ar: *std.ArrayList(u8), phrase: []const u8) mem.Allocator.Error!void {
try ar.appendSlice(phrase);
if (try rule_one(ar, phrase)) return;
ar.clearRetainingCapacity();
try ar.appendSlice(phrase);
if (try rule_three(ar, phrase)) return;
ar.clearRetainingCapacity();
try ar.appendSlice(phrase);
if (try rule_two(ar, phrase)) return;
ar.clearRetainingCapacity();
try ar.appendSlice(phrase);
_ = try rule_four(ar, phrase);
}
pub fn translate(allocator: mem.Allocator, phrase: []const u8) mem.Allocator.Error![]u8 {
var it = mem.splitScalar(u8, phrase, ' ');
const first = it.first();
var res = std.ArrayList(u8).init(allocator);
try translate_single(&res, first);
if (it.peek() == null) {
return res.toOwnedSlice();
}
var buf: [32]u8 = undefined;
var fba = std.heap.FixedBufferAllocator.init(&buf);
const fba_allocator = fba.allocator();
try res.appendSlice(" ");
while (it.next()) |word| {
var tmp = std.ArrayList(u8).init(fba_allocator);
try translate_single(&tmp, word);
try res.appendSlice(try tmp.toOwnedSlice());
try res.appendSlice(" ");
}
_ = res.pop();
return res.toOwnedSlice();
}

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const std = @import("std");
const testing = std.testing;
const pig_latin = @import("pig_latin.zig");
test "ay is added to words that start with vowels-word beginning with a" {
const expected: []const u8 = "appleay";
const actual = try pig_latin.translate(testing.allocator, "apple");
defer testing.allocator.free(actual);
try testing.expectEqualStrings(expected, actual);
}
test "ay is added to words that start with vowels-word beginning with e" {
const expected: []const u8 = "earay";
const actual = try pig_latin.translate(testing.allocator, "ear");
defer testing.allocator.free(actual);
try testing.expectEqualStrings(expected, actual);
}
test "ay is added to words that start with vowels-word beginning with i" {
const expected: []const u8 = "iglooay";
const actual = try pig_latin.translate(testing.allocator, "igloo");
defer testing.allocator.free(actual);
try testing.expectEqualStrings(expected, actual);
}
test "ay is added to words that start with vowels-word beginning with o" {
const expected: []const u8 = "objectay";
const actual = try pig_latin.translate(testing.allocator, "object");
defer testing.allocator.free(actual);
try testing.expectEqualStrings(expected, actual);
}
test "ay is added to words that start with vowels-word beginning with u" {
const expected: []const u8 = "underay";
const actual = try pig_latin.translate(testing.allocator, "under");
defer testing.allocator.free(actual);
try testing.expectEqualStrings(expected, actual);
}
test "ay is added to words that start with vowels-word beginning with a vowel and followed by a qu" {
const expected: []const u8 = "equalay";
const actual = try pig_latin.translate(testing.allocator, "equal");
defer testing.allocator.free(actual);
try testing.expectEqualStrings(expected, actual);
}
test "first letter and ay are moved to the end of words that start with consonants-word beginning with p" {
const expected: []const u8 = "igpay";
const actual = try pig_latin.translate(testing.allocator, "pig");
defer testing.allocator.free(actual);
try testing.expectEqualStrings(expected, actual);
}
test "first letter and ay are moved to the end of words that start with consonants-word beginning with k" {
const expected: []const u8 = "oalakay";
const actual = try pig_latin.translate(testing.allocator, "koala");
defer testing.allocator.free(actual);
try testing.expectEqualStrings(expected, actual);
}
test "first letter and ay are moved to the end of words that start with consonants-word beginning with x" {
const expected: []const u8 = "enonxay";
const actual = try pig_latin.translate(testing.allocator, "xenon");
defer testing.allocator.free(actual);
try testing.expectEqualStrings(expected, actual);
}
test "first letter and ay are moved to the end of words that start with consonants-word beginning with q without a following u" {
const expected: []const u8 = "atqay";
const actual = try pig_latin.translate(testing.allocator, "qat");
defer testing.allocator.free(actual);
try testing.expectEqualStrings(expected, actual);
}
test "some letter clusters are treated like a single consonant-word beginning with ch" {
const expected: []const u8 = "airchay";
const actual = try pig_latin.translate(testing.allocator, "chair");
defer testing.allocator.free(actual);
try testing.expectEqualStrings(expected, actual);
}
test "some letter clusters are treated like a single consonant-word beginning with qu" {
const expected: []const u8 = "eenquay";
const actual = try pig_latin.translate(testing.allocator, "queen");
defer testing.allocator.free(actual);
try testing.expectEqualStrings(expected, actual);
}
test "some letter clusters are treated like a single consonant-word beginning with qu and a preceding consonant" {
const expected: []const u8 = "aresquay";
const actual = try pig_latin.translate(testing.allocator, "square");
defer testing.allocator.free(actual);
try testing.expectEqualStrings(expected, actual);
}
test "some letter clusters are treated like a single consonant-word beginning with th" {
const expected: []const u8 = "erapythay";
const actual = try pig_latin.translate(testing.allocator, "therapy");
defer testing.allocator.free(actual);
try testing.expectEqualStrings(expected, actual);
}
test "some letter clusters are treated like a single consonant-word beginning with thr" {
const expected: []const u8 = "ushthray";
const actual = try pig_latin.translate(testing.allocator, "thrush");
defer testing.allocator.free(actual);
try testing.expectEqualStrings(expected, actual);
}
test "some letter clusters are treated like a single consonant-word beginning with sch" {
const expected: []const u8 = "oolschay";
const actual = try pig_latin.translate(testing.allocator, "school");
defer testing.allocator.free(actual);
try testing.expectEqualStrings(expected, actual);
}
test "some letter clusters are treated like a single vowel-word beginning with yt" {
const expected: []const u8 = "yttriaay";
const actual = try pig_latin.translate(testing.allocator, "yttria");
defer testing.allocator.free(actual);
try testing.expectEqualStrings(expected, actual);
}
test "some letter clusters are treated like a single vowel-word beginning with xr" {
const expected: []const u8 = "xrayay";
const actual = try pig_latin.translate(testing.allocator, "xray");
defer testing.allocator.free(actual);
try testing.expectEqualStrings(expected, actual);
}
test "position of y in a word determines if it is a consonant or a vowel-y is treated like a consonant at the beginning of a word" {
const expected: []const u8 = "ellowyay";
const actual = try pig_latin.translate(testing.allocator, "yellow");
defer testing.allocator.free(actual);
try testing.expectEqualStrings(expected, actual);
}
test "position of y in a word determines if it is a consonant or a vowel-y is treated like a vowel at the end of a consonant cluster" {
const expected: []const u8 = "ythmrhay";
const actual = try pig_latin.translate(testing.allocator, "rhythm");
defer testing.allocator.free(actual);
try testing.expectEqualStrings(expected, actual);
}
test "position of y in a word determines if it is a consonant or a vowel-y as second letter in two letter word" {
const expected: []const u8 = "ymay";
const actual = try pig_latin.translate(testing.allocator, "my");
defer testing.allocator.free(actual);
try testing.expectEqualStrings(expected, actual);
}
test "phrases are translated-a whole phrase" {
const expected: []const u8 = "ickquay astfay unray";
const actual = try pig_latin.translate(testing.allocator, "quick fast run");
defer testing.allocator.free(actual);
try testing.expectEqualStrings(expected, actual);
}