ziglings/exercises/023_errors3.zig

//
// One way to deal with error unions is to "catch" any error and
// replace it with a default value.
//
//     foo = canFail() catch 6;
//
// If canFail() fails, foo will equal 6.
//
const std = @import("std");

const MyNumberError = error{ TooSmall };

pub fn main() void{
  const a: u32 = addTwenty(44) catch 22;
  const b: u32 = addTwenty(4) catch 22;
  
  std.debug.print("a={}, b={}\n", .{ a, b });
}

// Please provide the return type from this function.
// Hint: it'll be an error union.
fn addTwenty(n: u32) MyNumberError!u32{
  if(n < 5){
    return MyNumberError.TooSmall;
  }else{
    return n + 20;
  }
}