29 lines
638 B
Zig
29 lines
638 B
Zig
//
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// One way to deal with error unions is to "catch" any error and
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// replace it with a default value.
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//
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// foo = canFail() catch 6;
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//
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// If canFail() fails, foo will equal 6.
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//
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const std = @import("std");
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const MyNumberError = error{TooSmall};
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pub fn main() void {
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var a: u32 = addTwenty(44) catch 22;
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var b: u32 = addTwenty(4) catch 22;
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std.debug.print("a={}, b={}\n", .{ a, b });
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}
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// Please provide the return type from this function.
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// Hint: it'll be an error union.
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fn addTwenty(n: u32) MyNumberError!u32 {
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if (n < 5) {
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return MyNumberError.TooSmall;
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} else {
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return n + 20;
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}
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}
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