. 242 47 融會貫通 - 練習 243 48 練習題的參考答案 244 XI 裸機開發：上午 245 49 歡迎瞭解 Rust 裸機開發 246 50 no_std 247 50.1 最簡單的 no_std 程式 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248 50.2 alloc . . . 標準程式庫包含各式實用巨集。 • println!(format, ..) prints a line to standard output, applying formatting described in std::fmt. • format!(format, ..) 的運作方式與 println! 類似，但會以字串形式傳回結果。 • dbg!(expression) 會記錄並傳回運算式的值。 • todo 等於size_of::>(). 如果想示範位元表示法實際運作時「可能」的樣子，可以使用下列範例程式碼。請務必注意，編譯器並 無對這個表示法提供保證，因此這完全不安全。 use std::mem::transmute; macro_rules! dbg_bits { ($e:expr, $bit_type:ty) => { println!("- {}: {:#x}", stringify

operations on any combination of predefined numeric types, whether primitive or composite, behave as expected. 6.1 Complex Numbers The global constant im is bound to the complex number i, representing the In particular, you can write C-style string code to process ASCII strings, and they will work as expected, both in terms of performance and semantics. If such code encounters non-ASCII text, it will gracefully view of the other). Unless the function docstring explicitly indicates that aliasing produces the expected result, it is the responsibility of the caller to ensure proper behavior on such inputs. 8.2 Argument-type

operations on any combination of predefined numeric types, whether primitive or composite, behave as expected. 6.1 Complex Numbers The global constant im is bound to the complex number i, representing the In particular, you can write C-style string code to process ASCII strings, and they will work as expected, both in terms of performance and semantics. If such code encounters non-ASCII text, it will gracefully view of the other). Unless the function docstring explicitly indicates that aliasing produces the expected result, it is the responsibility of the caller to ensure proper behavior on such inputs. 8.2 Argument-type

operations on any combination of predefined numeric types, whether primitive or composite, behave as expected. 7.1 Complex Numbers The global constant im is bound to the complex number i, representing the In particular, you can write C-style string code to process ASCII strings, and they will work as expected, both in terms of performance and semantics. If such code encounters non-ASCII text, it will gracefully of the other). Un- less the function docstring explicitly indicates that aliasing produces the expected result, it is the responsibility of the caller to ensure proper behavior on such inputs. 9.2 Argument-type

operations on any combination of predefined numeric types, whether primitive or composite, behave as expected. 7.1 Complex Numbers The global constant im is bound to the complex number i, representing the In particular, you can write C-style string code to process ASCII strings, and they will work as expected, both in terms of performance and semantics. If such code encounters non-ASCII text, it will gracefully of the other). Un- less the function docstring explicitly indicates that aliasing produces the expected result, it is the responsibility of the caller to ensure proper behavior on such inputs. 9.2 Argument-type

operations on any combination of predefined numeric types, whether primitive or composite, behave as expected. 7.1 Complex Numbers The global constant im is bound to the complex number i, representing the In particular, you can write C-style string code to process ASCII strings, and they will work as expected, both in terms of performance and semantics. If such code encounters non-ASCII text, it will gracefully of the other). Un- less the function docstring explicitly indicates that aliasing produces the expected result, it is the responsibility of the caller to ensure proper behavior on such inputs. 9.2 Argument-type

operations on any combination of predefined numeric types, whether primitive or composite, behave as expected. 7.1 Complex Numbers The global constant im is bound to the complex number i, representing the In particular, you can write C-style string code to process ASCII strings, and they will work as expected, both in terms of performance and semantics. If such code encounters non-ASCII text, it will gracefully of the other). Un- less the function docstring explicitly indicates that aliasing produces the expected result, it is the responsibility of the caller to ensure proper behavior on such inputs. 9.2 Argument-type

operations on any combination of predefined numeric types, whether primitive or composite, behave as expected. 7.1 Complex Numbers The global constant im is bound to the complex number i, representing the In particular, you can write C-style string code to process ASCII strings, and they will work as expected, both in terms of performance and semantics. If such code encounters non-ASCII text, it will gracefully of the other). Un- less the function docstring explicitly indicates that aliasing produces the expected result, it is the responsibility of the caller to ensure proper behavior on such inputs. 9.2 Argument-type

operations on any combination of predefined numeric types, whether primitive or composite, behave as expected. 7.1 Complex Numbers The global constant im is bound to the complex number i, representing the In particular, you can write C-style string code to process ASCII strings, and they will work as expected, both in terms of performance and semantics. If such code encounters non-ASCII text, it will gracefully of the other). Un- less the function docstring explicitly indicates that aliasing produces the expected result, it is the responsibility of the caller to ensure proper behavior on such inputs. 9.2 Argument-type

operations on any combination of predefined numeric types, whether primitive or composite, behave as expected. 7.1 Complex Numbers The global constant im is bound to the complex number i, representing the In particular, you can write C-style string code to process ASCII strings, and they will work as expected, both in terms of performance and semantics. If such code encounters non-ASCII text, it will gracefully of the other). Un- less the function docstring explicitly indicates that aliasing produces the expected result, it is the responsibility of the caller to ensure proper behavior on such inputs. 9.2 Argument-type