ziglings/exercises
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Make the example more realistic

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jacwil 2024-01-13 20:36:35 -08:00
parent 2bf830a4d5
commit a5a545259a
2 changed files with 13 additions and 12 deletions
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2
build.zig
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@ -913,7 +913,7 @@ const exercises = [_]Exercise{
},
.{
.main_file = "076_sentinels.zig",
.output = "Array:[ 1 2 3 0 5 6 ]. Many-item pointer:[ 1 2 3 ]. Array:[ 30 31 32 20 34 35 ]. Many-item pointer:[ 30 31 32 ].",
.output = "Array:[ 1 2 3 0 5 6 ]. Many-item pointer:[ 1 2 3 ]. Array:[ 5 4 3 ffff 1 0 ]. Many-item pointer:[ 5 4 3 ].",
},
.{
.main_file = "077_sentinels2.zig",

23
exercises/076_sentinels.zig
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@ -49,21 +49,22 @@ pub fn main() void {
const ptr: [*:0]u32 = &nums;
// Just to show not everything must be zero-terminated, here
// is a space-terminated array of u8 values 👾:
var space = [_:' ']u8{ '0', '1', '2', '3', '4', '5' };
// is max-value termination (bits are all ones, which can be
// interpereted as a -1 for a signed number type):
var morenums = [_:0xFFFF]u16{ 5, 4, 3, 2, 1, 0 };
// And here's a space-terminated many-item pointer:
const spaceptr: [*:' ']u8 = &space;
// And here's a max-value terminated many-item pointer:
const morenumsptr: [*:0xFFFF]u16 = &morenums;
// For fun, let's replace the value at position 3 with the
// sentinel value. This seems kind of naughty.
nums[3] = 0;
space[3] = ' ';
morenums[3] = 0xFFFF;
// Now we have a zero-terminated array, a space-terminated
// array, and a couple of many-item pointers that reference
// the same data: sequences of numbers that both end in and
// CONTAIN the sentinel value.
// Now we have a zero-terminated array, a max-value
// terminated array, and a couple of many-item pointers
// that reference the same data: sequences of numbers that
// both end in and CONTAIN the sentinel value.
//
// Attempting to loop through and print both of these should
// demonstrate how they are similar and different.
@ -73,8 +74,8 @@ pub fn main() void {
// at the first sentinel value.)
printSequence(nums);
printSequence(ptr);
printSequence(space);
printSequence(spaceptr);
printSequence(morenums);
printSequence(morenumsptr);
print("\n", .{});
}