From 55ad7c32f2d534b1fbd438204d21738f958c51a5 Mon Sep 17 00:00:00 2001 From: Dave Gauer Date: Tue, 9 Feb 2021 18:36:57 -0500 Subject: Moved exercises to exercises because exercises --- exercises/36_enums2.zig | 61 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) create mode 100644 exercises/36_enums2.zig (limited to 'exercises/36_enums2.zig') diff --git a/exercises/36_enums2.zig b/exercises/36_enums2.zig new file mode 100644 index 0000000..2e04415 --- /dev/null +++ b/exercises/36_enums2.zig @@ -0,0 +1,61 @@ +// +// Enums are really just a set of numbers. You can leave the +// numbering up to the compiler, or you can assign them +// explicitly. You can even specify the numeric type used. +// +// const Stuff = enum(u8){ foo = 16 }; +// +// You can get the integer out with a built-in function: +// +// var my_stuff: u8 = @enumToInt(Stuff.foo); +// +// Note how that built-in function starts with "@" just like the +// @import() function we've been using. +// +const std = @import("std"); + +// Zig lets us write integers in hexadecimal format: +// +// 0xf (is the value 15 in hex) +// +// Web browsers let us specify colors using a hexadecimal +// number where each byte represents the brightness of the +// Red, Green, or Blue component (RGB) where two hex digits +// are one byte with a value range of 0-255: +// +// #RRGGBB +// +// Please define and use a pure blue value Color: +const Color = enum(u32){ + red = 0xff0000, + green = 0x00ff00, + blue = ???, +}; + +pub fn main() void { + // Remeber Zig's multi-line strings? Here they are again. + // Also, check out this cool format string: + // + // {x:0>6} + // ^ + // x type ('x' is lower-case hexadecimal) + // : separator (needed for format syntax) + // 0 padding character (default is ' ') + // > alignment ('>' aligns right) + // 6 width (use padding to force width) + // + // Please add this formatting to the blue value. + // (Even better, experiment without it, or try parts of it + // to see what prints!) + std.debug.print( + \\

+ \\ Red + \\ Green + \\ Blue + \\

+ , .{ + @enumToInt(Color.red), + @enumToInt(Color.green), + @enumToInt(???), // Oops! We're missing something! + }); +} -- cgit v1.2.3-ZIG