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I started off with "hints" that required the poor student to piece together the information from incomplete bits. A complete example is like a picture that is worth 1000 words and far clearer.
51 lines
1.5 KiB
Zig
51 lines
1.5 KiB
Zig
//
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// Let's learn some array basics. Arrays are declared with:
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//
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// var foo [3]u32 = [3]u32{ 42, 108, 5423 };
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//
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// When Zig can infer the size of the array, you can use '_' for the
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// size. You can also let Zig infer the type of the value so the
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// declaration is much less verbose.
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//
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// var foo = [_]u32{ 42, 108, 5423 };
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//
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// Get values of an array using array[index] notation:
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//
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// const bar = foo[3]; // 5423
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//
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// Set values of an array using array[index] notation:
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//
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// foo[3] = 16;
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//
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// Get the length of an array using the len property:
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//
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// const length = foo.len;
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//
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const std = @import("std");
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pub fn main() void {
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// (Problem 1)
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// This "const" is going to cause a problem later - can you see what it is?
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// How do we fix it?
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const some_primes = [_]u8{ 1, 3, 5, 7, 11, 13, 17, 19 };
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// Individual values can be set with '[]' notation.
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// Example: This line changes the first prime to 2 (which is correct):
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some_primes[0] = 2;
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// Individual values can also be accessed with '[]' notation.
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// Example: This line stores the first prime in "first":
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const first = some_primes[0];
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// (Problem 2)
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// Looks like we need to complete this expression. Use the example
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// above to set "fourth" to the fourth element of the some_primes array:
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const fourth = some_primes[???];
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// (Problem 3)
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// Use the len property to get the length of the array:
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const length = some_primes.???;
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std.debug.print("First: {}, Fourth: {}, Length: {}\n",
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.{first, fourth, length});
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}
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