Zig: completed Leap and Difference of Squares

zig/difference-of-squares/.exercism/config.json

@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "massivelivefun"
+  ],
+  "files": {
+    "solution": [
+      "difference_of_squares.zig"
+    ],
+    "test": [
+      "test_difference_of_squares.zig"
+    ],
+    "example": [
+      ".meta/example.zig"
+    ]
+  },
+  "blurb": "Find the difference between the square of the sum and the sum of the squares of the first N natural numbers.",
+  "source": "Problem 6 at Project Euler",
+  "source_url": "https://projecteuler.net/problem=6"
+}

zig/difference-of-squares/.exercism/metadata.json

@@ -0,0 +1 @@
+{"track":"zig","exercise":"difference-of-squares","id":"05fde6d09bb749e38afa56a478926999","url":"https://exercism.org/tracks/zig/exercises/difference-of-squares","handle":"Chomp1295","is_requester":true,"auto_approve":false}

zig/difference-of-squares/HELP.md

@@ -0,0 +1,53 @@
+# 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 difference_of_squares.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

zig/difference-of-squares/README.md

@@ -0,0 +1,29 @@
+# Difference of Squares
+
+Welcome to Difference of Squares on Exercism's Zig Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Instructions
+
+Find the difference between the square of the sum and the sum of the squares of the first N natural numbers.
+
+The square of the sum of the first ten natural numbers is
+(1 + 2 + ... + 10)² = 55² = 3025.
+
+The sum of the squares of the first ten natural numbers is
+1² + 2² + ... + 10² = 385.
+
+Hence the difference between the square of the sum of the first ten natural numbers and the sum of the squares of the first ten natural numbers is 3025 - 385 = 2640.
+
+You are not expected to discover an efficient solution to this yourself from first principles; research is allowed, indeed, encouraged.
+Finding the best algorithm for the problem is a key skill in software engineering.
+
+## Source
+
+### Created by
+
+- @massivelivefun
+
+### Based on
+
+Problem 6 at Project Euler - https://projecteuler.net/problem=6

zig/difference-of-squares/difference_of_squares.zig

@@ -0,0 +1,19 @@
+pub fn squareOfSum(number: usize) usize {
+    var sum: usize = 0;
+    for (0..number + 1) |i| {
+        sum += i;
+    }
+    return sum * sum;
+}
+
+pub fn sumOfSquares(number: usize) usize {
+    var sum: usize = 0;
+    for (1..number + 1) |i| {
+        sum += i * i;
+    }
+    return sum;
+}
+
+pub fn differenceOfSquares(number: usize) usize {
+    return squareOfSum(number) - sumOfSquares(number);
+}

zig/difference-of-squares/test_difference_of_squares.zig

@@ -0,0 +1,58 @@
+const std = @import("std");
+const testing = std.testing;
+
+const difference_of_squares = @import("difference_of_squares.zig");
+
+test "square of sum up to 1" {
+    const expected: usize = 1;
+    const actual = difference_of_squares.squareOfSum(1);
+    try testing.expectEqual(expected, actual);
+}
+
+test "square of sum up to 5" {
+    const expected: usize = 225;
+    const actual = difference_of_squares.squareOfSum(5);
+    try testing.expectEqual(expected, actual);
+}
+
+test "square of sum up to 100" {
+    const expected: usize = 25_502_500;
+    const actual = difference_of_squares.squareOfSum(100);
+    try testing.expectEqual(expected, actual);
+}
+
+test "sum of squares up to 1" {
+    const expected: usize = 1;
+    const actual = difference_of_squares.sumOfSquares(1);
+    try testing.expectEqual(expected, actual);
+}
+
+test "sum of squares up to 5" {
+    const expected: usize = 55;
+    const actual = difference_of_squares.sumOfSquares(5);
+    try testing.expectEqual(expected, actual);
+}
+
+test "sum of squares up to 100" {
+    const expected: usize = 338_350;
+    const actual = difference_of_squares.sumOfSquares(100);
+    try testing.expectEqual(expected, actual);
+}
+
+test "difference of squares up to 1" {
+    const expected: usize = 0;
+    const actual = difference_of_squares.differenceOfSquares(1);
+    try testing.expectEqual(expected, actual);
+}
+
+test "difference of squares up to 5" {
+    const expected: usize = 170;
+    const actual = difference_of_squares.differenceOfSquares(5);
+    try testing.expectEqual(expected, actual);
+}
+
+test "difference of squares up to 100" {
+    const expected: usize = 25_164_150;
+    const actual = difference_of_squares.differenceOfSquares(100);
+    try testing.expectEqual(expected, actual);
+}

zig/leap/.exercism/config.json

@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "massivelivefun"
+  ],
+  "files": {
+    "solution": [
+      "leap.zig"
+    ],
+    "test": [
+      "test_leap.zig"
+    ],
+    "example": [
+      ".meta/example.zig"
+    ]
+  },
+  "blurb": "Given a year, report if it is a leap year.",
+  "source": "CodeRanch Cattle Drive, Assignment 3",
+  "source_url": "https://coderanch.com/t/718816/Leap"
+}

zig/leap/.exercism/metadata.json

@@ -0,0 +1 @@
+{"track":"zig","exercise":"leap","id":"c311a440c14b4ef084adf8482af46d12","url":"https://exercism.org/tracks/zig/exercises/leap","handle":"Chomp1295","is_requester":true,"auto_approve":false}

zig/leap/HELP.md

@@ -0,0 +1,53 @@
+# 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 leap.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 Learn][zig-learn] 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-learn]: https://ziglearn.org/
+[ziglings]: https://github.com/ratfactor/ziglings

zig/leap/README.md

@@ -0,0 +1,37 @@
+# Leap
+
+Welcome to Leap on Exercism's Zig Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Instructions
+
+Given a year, report if it is a leap year.
+
+The tricky thing here is that a leap year in the Gregorian calendar occurs:
+
+```text
+on every year that is evenly divisible by 4
+  except every year that is evenly divisible by 100
+    unless the year is also evenly divisible by 400
+```
+
+For example, 1997 is not a leap year, but 1996 is.
+1900 is not a leap year, but 2000 is.
+
+## Notes
+
+Though our exercise adopts some very simple rules, there is more to learn!
+
+For a delightful, four minute explanation of the whole leap year phenomenon, go watch [this youtube video][video].
+
+[video]: https://www.youtube.com/watch?v=xX96xng7sAE
+
+## Source
+
+### Created by
+
+- @massivelivefun
+
+### Based on
+
+CodeRanch Cattle Drive, Assignment 3 - https://coderanch.com/t/718816/Leap

zig/leap/leap.zig

@@ -0,0 +1,12 @@
+pub fn isLeapYear(year: u32) bool {
+    if (year % 4 == 0) {
+        if (year % 100 == 0) {
+            if (year % 400 == 0) {
+                return true;
+            }
+            return false;
+        }
+        return true;
+    }
+    return false;
+}

zig/leap/test_leap.zig

@@ -0,0 +1,40 @@
+const std = @import("std");
+const testing = std.testing;
+
+const leap = @import("leap.zig");
+
+test "year not divisible by 4 in common year" {
+    try testing.expect(!leap.isLeapYear(2015));
+}
+
+test "year divisible by 2, not divisible by 4 in common year" {
+    try testing.expect(!leap.isLeapYear(1970));
+}
+
+test "year divisible by 4, not divisible by 100 in leap year" {
+    try testing.expect(leap.isLeapYear(1996));
+}
+
+test "year divisible by 4 and 5 is still a leap year" {
+    try testing.expect(leap.isLeapYear(1960));
+}
+
+test "year divisible by 100, not divisible by 400 in common year" {
+    try testing.expect(!leap.isLeapYear(2100));
+}
+
+test "year divisible by 100 but not by 3 is still not a leap year" {
+    try testing.expect(!leap.isLeapYear(1900));
+}
+
+test "year divisible by 400 is leap year" {
+    try testing.expect(leap.isLeapYear(2000));
+}
+
+test "year divisible by 400 but not by 125 is still a leap year" {
+    try testing.expect(leap.isLeapYear(2400));
+}
+
+test "year divisible by 200, not divisible by 400 in common year" {
+    try testing.expect(!leap.isLeapYear(1800));
+}