ziglings.org/exercises/034_quiz4.zig

//
// Quiz time. See if you can make this program work!
//
// Solve this any way you like, just be sure the output is:
//
//     my_num=42
//
const std = @import("std");

const NumError = error{IllegalNumber};

pub fn main() !void {
    const stdout = std.io.getStdOut().writer();

    const my_num: u32 = try getNumber();

    // if (my_num) |value| {
    // stdout("ZIG! {!}", .{value});
    // } else |err| switch (err) {
    // NumError.IllegalNumber => 42,
    // }

    try stdout.print("my_num={}\n", .{my_num});
}

// This function is obviously weird and non-functional. But you will not be changing it for this quiz.
fn getNumber() NumError!u32 {
    if (false) return NumError.IllegalNumber;
    return 42;
}