6ad9774189
When I hit 999 exercises, I will finally have reached the ultimate state of soteriological release and no more exercises will be needed. The cycle will be complete. All that will be left is perfect quietude, freedom, and highest happiness.
50 lines
1.6 KiB
Zig
50 lines
1.6 KiB
Zig
//
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// We've seen that passing arrays around can be awkward. Perhaps you
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// remember a particularly horrendous function definition from quiz3?
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// This function can only take arrays that are exactly 4 items long!
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//
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// fn printPowersOfTwo(numbers: [4]u16) void { ... }
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//
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// That's the trouble with arrays - their size is part of the data
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// type and must be hard-coded into every usage of that type. This
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// digits array is a [10]u8 forever and ever:
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//
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// var digits = [10]u8{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
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//
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// Thankfully, Zig has slices, which let you dynamically point to a
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// start item and provide a length. Here are slices of our digit
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// array:
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//
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// const foo = digits[0..1]; // 0
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// const bar = digits[3..9]; // 3 4 5 6 7 8
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// const all = digits[0..]; // 0 1 2 3 4 5 6 7 8 9
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//
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// As you can see, a slice [x..y] defines a first item by index x and
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// a length y (where y-1 is the index of the last item). Leaving y off
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// gives you the rest of the items.
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//
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// Notice that the type of a slice on an array of u8 items is []u8.
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//
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const std = @import("std");
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pub fn main() void {
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var cards = [8]u8{ 'A', '4', 'K', '8', '5', '2', 'Q', 'J' };
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// Please put the first 4 cards in hand1 and the rest in hand2.
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const hand1: []u8 = cards[???];
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const hand2: []u8 = cards[???];
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std.debug.print("Hand1: ", .{});
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printHand(hand1);
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std.debug.print("Hand2: ", .{});
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printHand(hand2);
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}
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// Please lend this function a hand. A u8 slice hand, that is.
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fn printHand(hand: ???) void {
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for (hand) |h| {
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std.debug.print("{u} ", .{h});
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}
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}
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