Merge pull request 'Add exercises for packed structs/unions' (#374) from justusk/ziglings:packed into main

Reviewed-on: https://codeberg.org/ziglings/exercises/pulls/374

2 files changed, 89 insertions, 0 deletions

diff --git a/patches/patches/111_packed.patch b/patches/patches/111_packed.patch
new file mode 100644
index 0000000..d38ac68
--- /dev/null
+++ b/patches/patches/111_packed.patch
@@ -0,0 +1,57 @@
+--- exercises/111_packed.zig	2026-03-13 11:18:44
++++ answers/111_packed.zig	2026-03-13 11:18:57
+@@ -41,7 +41,7 @@
+ 
+ const PackedStruct = packed struct {
+     a: u2,
+-    b: u?,
++    b: u4,
+ };
+ 
+ comptime {
+@@ -50,7 +50,7 @@
+ 
+ const PackedUnion = packed union {
+     a: bool,
+-    b: u?,
++    b: u1,
+ };
+ 
+ comptime {
+@@ -113,31 +113,31 @@
+ pub fn main() void {
+     {
+         const expected: Bits = @bitCast(@as(u4, 0b1000));
+-        const my_bits: Bits = .{};
++        const my_bits: Bits = .{ .d = 1 };
+         if (my_bits != expected) complain(my_bits, expected, @src());
+     }
+ 
+     {
+         const expected: Bits = @bitCast(@as(u4, 0b0001));
+-        const my_bits: Bits = .{};
++        const my_bits: Bits = .{ .a = 1 };
+         if (my_bits != expected) complain(my_bits, expected, @src());
+     }
+ 
+     {
+         const expected: Bits = @bitCast(@as(u4, 0b0010));
+-        const my_bits: Bits = .{};
++        const my_bits: Bits = .{ .b = 1 };
+         if (my_bits != expected) complain(my_bits, expected, @src());
+     }
+ 
+     {
+         const expected: Bits = @bitCast(@as(u4, 0b0011));
+-        const my_bits: Bits = .{};
++        const my_bits: Bits = .{ .a = 1, .b = 1 };
+         if (my_bits != expected) complain(my_bits, expected, @src());
+     }
+ 
+     {
+         const expected: Bits = @bitCast(@as(u4, 0b1101));
+-        const my_bits: Bits = .{};
++        const my_bits: Bits = .{ .a = 1, .c = 1, .d = 1 };
+         if (my_bits != expected) complain(my_bits, expected, @src());
+     }
+ }
diff --git a/patches/patches/112_packed2.patch b/patches/patches/112_packed2.patch
new file mode 100644
index 0000000..9b01eb3
--- /dev/null
+++ b/patches/patches/112_packed2.patch
@@ -0,0 +1,32 @@
+--- exercises/112_packed2.zig	2026-03-13 11:14:08
++++ answers/112_packed2.zig	2026-03-13 11:14:16
+@@ -13,9 +13,9 @@
+     const s: S = .{ .a = true, .b = -1 };
+     switch (s) {
+         .{ .a = true, .b = -1 } => {}, // ok!
+-        .{ .a = true, .b = ??? },
+-        .{ .a = ???, .b = 0 },
+-        .{ .a = ???, .b = ??? },
++        .{ .a = true, .b = 0 },
++        .{ .a = false, .b = 0 },
++        .{ .a = false, .b = -1 },
+         => @compileError("We don't want to end up here!"),
+     }
+ }
+@@ -39,7 +39,6 @@
+         .{ .a = 3 } => {}, // ok!
+         .{ .a = 2 },
+         .{ .b = 1 },
+-        .{ .b = -1 },
+         .{ .a = 0 },
+         => @compileError("We don't want to end up here!"),
+     }
+@@ -65,7 +64,7 @@
+     // Reminder: if the sign bit of a float is set, the number is negative!
+ 
+     var number: Float = .{ .value = 2.34 };
+-    number.bits.??? = ???;
++    number.bits.sign = 1;
+     if (number.value != -2.34) {
+         std.debug.print("Make it negative!\n", .{});
+     }