ziglings/exercises/025_errors5.zig

//
// Zig has a handy "try" shortcut for this common error handling pattern:
//
//     canFail() catch |err| return err;
//
// which can be more compactly written as:
//
//     try canFail();
//
const std = @import("std");

const MyNumberError = error{
  TooSmall,
  TooBig,
};

pub fn main() void{
  const a: u32 = addFive(44) catch 0;
  const b: u32 = addFive(14) catch 0;
  const c: u32 = addFive(4) catch 0;
  
  std.debug.print("a={}, b={}, c={}\n", .{ a, b, c });
}

fn addFive(n: u32) MyNumberError!u32{
  // This function needs to return any error which might come back from detect().
  // Please use a "try" statement rather than a "catch".
  //
  const x = try detect(n);
  
  return x + 5;
}

fn detect(n: u32) MyNumberError!u32{
  if(n < 10){ return MyNumberError.TooSmall; }
  if(n > 20){ return MyNumberError.TooBig; }
  return n;
}