44 lines
1.2 KiB
Zig
44 lines
1.2 KiB
Zig
//
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// Let's see if we can make use of some of things we've learned so far.
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// We'll create two functions: one that contains a "for" loop and one
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// that contains a "while" loop.
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//
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// Both of these are simply labeled "loop" below.
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//
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const std = @import("std");
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pub fn main() void {
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const my_numbers = [4]u16{ 5, 6, 7, 8 };
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printPowersOfTwo(my_numbers);
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std.debug.print("\n", .{});
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}
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// You won't see this every day: a function that takes an array with
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// exactly four u16 numbers. This is not how you would normally pass
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// an array to a function. We'll learn about slices and pointers in
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// a little while. For now, we're using what we know.
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//
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// This function prints, but does not return anything.
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//
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fn printPowersOfTwo(numbers: [4]u16) void {
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for (numbers) |n| {
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std.debug.print("{} ", .{twoToThe(n)});
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}
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}
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// This function bears a striking resemblance to twoToThe() in the last
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// exercise. But don't be fooled! This one does the math without the aid
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// of the standard library!
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//
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fn twoToThe(number: u16) u16 {
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var n: u16 = 0;
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var total: u16 = 1;
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while (n < number) : (n += 1) {
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total *= 2;
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}
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return total;
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}
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