39 lines
862 B
Zig
39 lines
862 B
Zig
//
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// Zig has a handy "try" shortcut for this common error handling pattern:
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//
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// canFail() catch |err| return err;
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//
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// which can be more compactly written as:
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//
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// try canFail();
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//
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const std = @import("std");
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const MyNumberError = error{
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TooSmall,
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TooBig,
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};
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pub fn main() void {
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var a: u32 = addFive(44) catch 0;
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var b: u32 = addFive(14) catch 0;
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var c: u32 = addFive(4) catch 0;
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std.debug.print("a={}, b={}, c={}\n", .{ a, b, c });
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}
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fn addFive(n: u32) MyNumberError!u32 {
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// This function needs to return any error which might come back from detect().
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// Please use a "try" statement rather than a "catch".
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//
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var x = try detect(n);
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return x + 5;
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}
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fn detect(n: u32) MyNumberError!u32 {
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if (n < 10) return MyNumberError.TooSmall;
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if (n > 20) return MyNumberError.TooBig;
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return n;
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}
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