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{
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"authors": [
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"massivelivefun"
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],
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"contributors": [
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"ee7"
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],
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"files": {
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"solution": [
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"grains.zig"
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],
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"test": [
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"test_grains.zig"
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],
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"example": [
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".meta/example.zig"
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]
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},
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"blurb": "Calculate the number of grains of wheat on a chessboard given that the number on each square doubles.",
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"source": "The CodeRanch Cattle Drive, Assignment 6",
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"source_url": "https://coderanch.com/wiki/718824/Grains"
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}
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@ -1 +0,0 @@
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{"track":"zig","exercise":"grains","id":"04039904d0414848b219497a9a412373","url":"https://exercism.org/tracks/zig/exercises/grains","handle":"Chomp1295","is_requester":true,"auto_approve":false}
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@ -1,53 +0,0 @@
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# Help
|
||||
|
||||
## Running the tests
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||||
|
||||
Write your code in `<exercise_name>.zig`.
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||||
|
||||
To run the tests for an exercise, run:
|
||||
|
||||
```bash
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zig test test_exercise_name.zig
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```
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||||
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in the exercise's root directory (replacing `exercise_name` with the name of the exercise).
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||||
|
||||
## Submitting your solution
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||||
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You can submit your solution using the `exercism submit grains.zig` command.
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||||
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
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[documentation]: https://ziglang.org/documentation/master
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[irc]: https://webchat.freenode.net/?channels=%23zig
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||||
[reddit]: https://www.reddit.com/r/Zig
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[stack-overflow]: https://stackoverflow.com/questions/tagged/zig
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[zig-guide]: https://zig.guide/
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[ziglings]: https://codeberg.org/ziglings/exercises
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@ -1,34 +0,0 @@
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# Grains
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Welcome to Grains on Exercism's Zig Track.
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If you need help running the tests or submitting your code, check out `HELP.md`.
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## Instructions
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Calculate the number of grains of wheat on a chessboard given that the number on each square doubles.
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There once was a wise servant who saved the life of a prince.
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The king promised to pay whatever the servant could dream up.
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Knowing that the king loved chess, the servant told the king he would like to have grains of wheat.
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One grain on the first square of a chess board, with the number of grains doubling on each successive square.
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There are 64 squares on a chessboard (where square 1 has one grain, square 2 has two grains, and so on).
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Write code that shows:
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- how many grains were on a given square, and
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- the total number of grains on the chessboard
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## Source
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||||
|
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### Created by
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- @massivelivefun
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### Contributed to by
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- @ee7
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||||
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||||
### Based on
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||||
|
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The CodeRanch Cattle Drive, Assignment 6 - https://coderanch.com/wiki/718824/Grains
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|
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const std = @import("std");
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pub const ChessboardError = error{IndexOutOfBounds};
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pub fn square(index: usize) ChessboardError!u64 {
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if (index > 64 or index < 1) return error.IndexOutOfBounds;
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return std.math.pow(u64, 2, index - 1);
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}
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pub fn total() u64 {
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return std.math.maxInt(u64);
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}
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const std = @import("std");
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const testing = std.testing;
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const grains = @import("grains.zig");
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const ChessboardError = grains.ChessboardError;
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test "grains on square 1" {
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const expected: u64 = 1;
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const actual = try grains.square(1);
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try testing.expectEqual(expected, actual);
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}
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test "grains on square 2" {
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const expected: u64 = 2;
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const actual = try grains.square(2);
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try testing.expectEqual(expected, actual);
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}
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test "grains on square 3" {
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const expected: u64 = 4;
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const actual = try grains.square(3);
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try testing.expectEqual(expected, actual);
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}
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test "grains on square 4" {
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const expected: u64 = 8;
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const actual = try grains.square(4);
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try testing.expectEqual(expected, actual);
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}
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test "grains on square 16" {
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const expected: u64 = 32_768;
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const actual = try grains.square(16);
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try testing.expectEqual(expected, actual);
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}
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test "grains on square 32" {
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const expected: u64 = 2_147_483_648;
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const actual = try grains.square(32);
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try testing.expectEqual(expected, actual);
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}
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test "grains on square 64" {
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const expected: u64 = 9_223_372_036_854_775_808;
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const actual = try grains.square(64);
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try testing.expectEqual(expected, actual);
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}
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test "square 0 produces an error" {
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const expected = ChessboardError.IndexOutOfBounds;
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const actual = grains.square(0);
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try testing.expectError(expected, actual);
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}
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test "square greater than 64 produces an error" {
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const expected = ChessboardError.IndexOutOfBounds;
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const actual = grains.square(65);
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try testing.expectError(expected, actual);
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}
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test "returns the total number of grains on the board" {
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const expected: u64 = 18_446_744_073_709_551_615;
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const actual = grains.total();
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try testing.expectEqual(expected, actual);
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||||
}
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|
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@ -1,19 +0,0 @@
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|||
{
|
||||
"authors": [
|
||||
"ee7"
|
||||
],
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||||
"files": {
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||||
"solution": [
|
||||
"isbn_verifier.zig"
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||||
],
|
||||
"test": [
|
||||
"test_isbn_verifier.zig"
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||||
],
|
||||
"example": [
|
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".meta/example.zig"
|
||||
]
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||||
},
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||||
"blurb": "Check if a given string is a valid ISBN-10 number.",
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"source": "Converting a string into a number and some basic processing utilizing a relatable real world example.",
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"source_url": "https://en.wikipedia.org/wiki/International_Standard_Book_Number#ISBN-10_check_digit_calculation"
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||||
}
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||||
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@ -1 +0,0 @@
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{"track":"zig","exercise":"isbn-verifier","id":"6fb4e96621bf4b30a2306e514899179c","url":"https://exercism.org/tracks/zig/exercises/isbn-verifier","handle":"Chomp1295","is_requester":true,"auto_approve":false}
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||||
|
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@ -1,53 +0,0 @@
|
|||
# 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 isbn_verifier.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
|
||||
|
|
@ -1,57 +0,0 @@
|
|||
# ISBN Verifier
|
||||
|
||||
Welcome to ISBN Verifier on Exercism's Zig Track.
|
||||
If you need help running the tests or submitting your code, check out `HELP.md`.
|
||||
|
||||
## Instructions
|
||||
|
||||
The [ISBN-10 verification process][isbn-verification] is used to validate book identification numbers.
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These normally contain dashes and look like: `3-598-21508-8`
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|
||||
## ISBN
|
||||
|
||||
The ISBN-10 format is 9 digits (0 to 9) plus one check character (either a digit or an X only).
|
||||
In the case the check character is an X, this represents the value '10'.
|
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These may be communicated with or without hyphens, and can be checked for their validity by the following formula:
|
||||
|
||||
```text
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(d₁ * 10 + d₂ * 9 + d₃ * 8 + d₄ * 7 + d₅ * 6 + d₆ * 5 + d₇ * 4 + d₈ * 3 + d₉ * 2 + d₁₀ * 1) mod 11 == 0
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```
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||||
|
||||
If the result is 0, then it is a valid ISBN-10, otherwise it is invalid.
|
||||
|
||||
## Example
|
||||
|
||||
Let's take the ISBN-10 `3-598-21508-8`.
|
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We plug it in to the formula, and get:
|
||||
|
||||
```text
|
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(3 * 10 + 5 * 9 + 9 * 8 + 8 * 7 + 2 * 6 + 1 * 5 + 5 * 4 + 0 * 3 + 8 * 2 + 8 * 1) mod 11 == 0
|
||||
```
|
||||
|
||||
Since the result is 0, this proves that our ISBN is valid.
|
||||
|
||||
## Task
|
||||
|
||||
Given a string the program should check if the provided string is a valid ISBN-10.
|
||||
Putting this into place requires some thinking about preprocessing/parsing of the string prior to calculating the check digit for the ISBN.
|
||||
|
||||
The program should be able to verify ISBN-10 both with and without separating dashes.
|
||||
|
||||
## Caveats
|
||||
|
||||
Converting from strings to numbers can be tricky in certain languages.
|
||||
Now, it's even trickier since the check digit of an ISBN-10 may be 'X' (representing '10').
|
||||
For instance `3-598-21507-X` is a valid ISBN-10.
|
||||
|
||||
[isbn-verification]: https://en.wikipedia.org/wiki/International_Standard_Book_Number
|
||||
|
||||
## Source
|
||||
|
||||
### Created by
|
||||
|
||||
- @ee7
|
||||
|
||||
### Based on
|
||||
|
||||
Converting a string into a number and some basic processing utilizing a relatable real world example. - https://en.wikipedia.org/wiki/International_Standard_Book_Number#ISBN-10_check_digit_calculation
|
||||
|
|
@ -1,40 +0,0 @@
|
|||
const std = @import("std");
|
||||
|
||||
pub fn isValidIsbn10(s: []const u8) bool {
|
||||
if (s.len < 10) return false;
|
||||
|
||||
var isbn: [10]u8 = undefined;
|
||||
var pos: usize = 0;
|
||||
|
||||
for (s) |c| {
|
||||
if (pos == 10) return false;
|
||||
|
||||
isbn[pos] = switch (c) {
|
||||
'-' => continue,
|
||||
'0'...'9' => blk: {
|
||||
pos += 1;
|
||||
break :blk std.fmt.parseInt(u8, &[_]u8{c}, 10) catch unreachable;
|
||||
},
|
||||
else => blk: {
|
||||
if (c == 'X' and pos == 9) {
|
||||
pos += 1;
|
||||
break :blk 10;
|
||||
} else {
|
||||
return false;
|
||||
}
|
||||
},
|
||||
};
|
||||
}
|
||||
|
||||
var sum: u32 = 0;
|
||||
var factor: usize = 10;
|
||||
var i: usize = 0;
|
||||
while (factor > 0) : ({
|
||||
factor -= 1;
|
||||
i += 1;
|
||||
}) {
|
||||
sum += @intCast(isbn[i] * factor);
|
||||
}
|
||||
|
||||
return sum % 11 == 0;
|
||||
}
|
||||
|
|
@ -1,80 +0,0 @@
|
|||
const std = @import("std");
|
||||
const testing = std.testing;
|
||||
|
||||
const isValidIsbn10 = @import("isbn_verifier.zig").isValidIsbn10;
|
||||
|
||||
test "valid ISBN" {
|
||||
try testing.expect(isValidIsbn10("3-598-21508-8"));
|
||||
}
|
||||
|
||||
test "invalid ISBN check digit" {
|
||||
try testing.expect(!isValidIsbn10("3-598-21508-9"));
|
||||
}
|
||||
|
||||
test "valid ISBN with a check digit of 10" {
|
||||
try testing.expect(isValidIsbn10("3-598-21507-X"));
|
||||
}
|
||||
|
||||
test "check digit is a character other than x" {
|
||||
try testing.expect(!isValidIsbn10("3-598-21507-A"));
|
||||
}
|
||||
|
||||
test "invalid check digit in ISBN is not treated as zero" {
|
||||
try testing.expect(!isValidIsbn10("4-598-21507-B"));
|
||||
}
|
||||
|
||||
test "invalid character in ISBN is not treated as zero" {
|
||||
try testing.expect(!isValidIsbn10("3-598-P1581-X"));
|
||||
}
|
||||
|
||||
test "x is only valid as a check digit" {
|
||||
try testing.expect(!isValidIsbn10("3-598-2X507-9"));
|
||||
}
|
||||
|
||||
test "valid ISBN without separating dashes" {
|
||||
try testing.expect(isValidIsbn10("3598215088"));
|
||||
}
|
||||
|
||||
test "ISBN without separating dashes and x as check digit" {
|
||||
try testing.expect(isValidIsbn10("359821507X"));
|
||||
}
|
||||
|
||||
test "ISBN without check digit and dashes" {
|
||||
try testing.expect(!isValidIsbn10("359821507"));
|
||||
}
|
||||
|
||||
test "too long ISBN and no dashes" {
|
||||
try testing.expect(!isValidIsbn10("3598215078X"));
|
||||
}
|
||||
|
||||
test "too short ISBN" {
|
||||
try testing.expect(!isValidIsbn10("00"));
|
||||
}
|
||||
|
||||
test "ISBN without check digit" {
|
||||
try testing.expect(!isValidIsbn10("3-598-21507"));
|
||||
}
|
||||
|
||||
test "check digit of x should not be used for 0" {
|
||||
try testing.expect(!isValidIsbn10("3-598-21515-X"));
|
||||
}
|
||||
|
||||
test "empty ISBN" {
|
||||
try testing.expect(!isValidIsbn10(""));
|
||||
}
|
||||
|
||||
test "input is 9 characters" {
|
||||
try testing.expect(!isValidIsbn10("134456729"));
|
||||
}
|
||||
|
||||
test "invalid characters are not ignored after checking length" {
|
||||
try testing.expect(!isValidIsbn10("3132P34035"));
|
||||
}
|
||||
|
||||
test "invalid characters are not ignored before checking length" {
|
||||
try testing.expect(!isValidIsbn10("3598P215088"));
|
||||
}
|
||||
|
||||
test "input is too long but contains a valid ISBN" {
|
||||
try testing.expect(!isValidIsbn10("98245726788"));
|
||||
}
|
||||
Loading…
Reference in a new issue