From 738a9f6cda62f3570e44dc93f8e200afc2cc1b51 Mon Sep 17 00:00:00 2001 From: Dave Gauer Date: Wed, 3 Feb 2021 19:19:31 -0500 Subject: Inserted ex. 32 unreachable, added quiz4. --- 32_iferror.zig | 49 ------------------------------------------------- 1 file changed, 49 deletions(-) delete mode 100644 32_iferror.zig (limited to '32_iferror.zig') diff --git a/32_iferror.zig b/32_iferror.zig deleted file mode 100644 index ed92e94..0000000 --- a/32_iferror.zig +++ /dev/null @@ -1,49 +0,0 @@ -// -// Let's revisit the very first error exercise. This time, we're going to -// look at a special error-handling type of the "if" statement. -// -// if (foo) |value| { -// -// // foo was NOT an error; value is the non-error value of foo -// -// } else |err| { -// -// // foo WAS an error; err is the error value of foo -// -// } -// -// We'll take it even further and use a switch statement to handle -// the error types. -// -const MyNumberError = error{ - TooBig, - TooSmall, -}; - -const std = @import("std"); - -pub fn main() void { - var nums = [_]u8{2,3,4,5,6}; - - for (nums) |num| { - std.debug.print("{}", .{num}); - - var n = numberMaybeFail(num); - if (n) |value| { - std.debug.print("=4. ", .{}); - } else |err| switch (err) { - MyNumberError.TooBig => std.debug.print(">4. ", .{}), - // Please add a match for TooSmall here and have it print: "<4. " - } - } - - std.debug.print("\n", .{}); -} - -// This time we'll have numberMaybeFail() return an error union rather -// than a straight error. -fn numberMaybeFail(n: u8) MyNumberError!u8 { - if(n > 4) return MyNumberError.TooBig; - if(n < 4) return MyNumberError.TooSmall; - return n; -} -- cgit v1.2.3-ZIG