diff options
Diffstat (limited to 'exercises/076_sentinels.zig')
| -rw-r--r-- | exercises/076_sentinels.zig | 46 |
1 files changed, 14 insertions, 32 deletions
diff --git a/exercises/076_sentinels.zig b/exercises/076_sentinels.zig index 4cd25e9..4c16e7c 100644 --- a/exercises/076_sentinels.zig +++ b/exercises/076_sentinels.zig @@ -29,11 +29,11 @@ // Slice 'b' is only allowed to point to zero-terminated arrays // but otherwise works just like a normal slice. // -// Pointer 'c' is exactly like the many-pointers we learned about -// in exercise 054, but it is guaranteed to end in 0. Because of -// this guarantee, we can safely find the end of this -// many-pointer without knowing its length. (We CAN'T do that -// with regular many-pointers!). +// Pointer 'c' is exactly like the many-item pointers we learned +// about in exercise 054, but it is guaranteed to end in 0. +// Because of this guarantee, we can safely find the end of this +// many-item pointer without knowing its length. (We CAN'T do +// that with regular many-item pointers!). // const print = @import("std").debug.print; @@ -41,24 +41,25 @@ pub fn main() void { // Here's a zero-terminated array of u32 values: var nums = [_:0]u32{ 1, 2, 3, 4, 5, 6 }; - // And here's a zero-terminated many-pointer: + // And here's a zero-terminated many-item pointer: var ptr: [*:0]u32 = &nums; // For fun, let's replace the value at position 3 with the // sentinel value 0. This seems kind of naughty. nums[3] = 0; - // So now we have a zero-terminated array and a many-pointer - // that reference the same data: a sequence of numbers that - // both ends in and CONTAINS the sentinal value. + // So now we have a zero-terminated array and a many-item + // pointer that reference the same data: a sequence of + // numbers that both ends in and CONTAINS the sentinal value. // // Attempting to loop through and print both of these should // demonstrate how they are similar and different. // // (It turns out that the array prints completely, including - // the sentinel 0 in the middle. The many-pointer must stop - // at the first sentinel value. The difference is simply that - // arrays have a known length and many-pointers don't.) + // the sentinel 0 in the middle. The many-item pointer must + // stop at the first sentinel value. The difference is simply + // that arrays have a known length and many-item pointers + // don't.) printSequence(nums); printSequence(ptr); @@ -86,7 +87,7 @@ fn printSequence(my_seq: anytype) void { .Pointer => { // Check this out - it's pretty cool: const my_sentinel = my_type.Pointer.sentinel; - print("Many-pointer:", .{}); + print("Many-item pointer:", .{}); // Loop through the items in my_seq until we hit the // sentinel value. @@ -100,22 +101,3 @@ fn printSequence(my_seq: anytype) void { } print(". ", .{}); } -// -// ------------------------------------------------------------ -// TOP SECRET TOP SECRET TOP SECRET TOP SECRET TOP SECRET -// ------------------------------------------------------------ -// -// Are you ready for the THE TRUTH about Zig string literals? -// -// You've earned it. Here it is: -// -// @TypeOf("foo") == *const [3:0]u8 -// -// Zig's string literals are constant pointers to zero-terminated -// (or "null-terminated") arrays of u8. -// -// Now you know. Welcome to the secret club! -// -// ------------------------------------------------------------ -// TOP SECRET TOP SECRET TOP SECRET TOP SECRET TOP SECRET -// ------------------------------------------------------------ |