ALGOL W
外觀
編程範型 | 多范型:過程式, 指令式, 結構化 |
---|---|
語言家族 | ALGOL |
設計者 | Niklaus Wirth, Tony Hoare |
面市時間 | 1966年 |
型態系統 | 靜態, 強類型 |
作用域 | 詞法 |
實作語言 | PL360 |
系統平台 | IBM System/360 |
啟發語言 | |
ALGOL 60 | |
影響語言 | |
Pascal, Modula-2 |
ALGOL W,一種程式語言,為ALGOL家族的一份子。它基於尼克勞斯·維爾特與東尼·霍爾在IFIP Working Group 2.1提出的 ALGOL X草案而設計,希望能作為ALGOL 60的後繼者[1]。經過小幅度的修改[2],在史丹佛大學,尼克勞斯·維爾特利用IBM System/360機器,以PL360實作出第一版的ALGOL W[3] 。
它的編譯器是用尼克勞斯·維爾特所設計的PL360組語所寫成[4]。
例子
[編輯]下面例子展示ALGOL W的記錄類型設施:
RECORD PERSON (
STRING(20) NAME;
INTEGER AGE;
LOGICAL MALE;
REFERENCE(PERSON) FATHER, MOTHER, YOUNGESTOFFSPRING, ELDERSIBLING
);
REFERENCE(PERSON) PROCEDURE YOUNGESTUNCLE (REFERENCE(PERSON) R);
BEGIN
REFERENCE(PERSON) P, M;
P := YOUNGESTOFFSPRING(FATHER(FATHER(R)));
WHILE (P ¬= NULL) AND (¬ MALE(P)) OR (P = FATHER(R)) DO
P := ELDERSIBLING(P);
M := YOUNGESTOFFSPRING(MOTHER(MOTHER(R)));
WHILE (M ¬= NULL) AND (¬ MALE(M)) DO
M := ELDERSIBLING(M);
IF P = NULL THEN
M
ELSE IF M = NULL THEN
P
ELSE
IF AGE(P) < AGE(M) THEN P ELSE M
END
引用
[編輯]- ^ Niklaus Wirth & C. A. R Hoare (1966) A contribution to the development of ALGOL. Communications of the ACM, Vol.9, pp. 413–432
- ^ Niklaus Wirth (1966), Additional notes on "A Contribution to the Development of ALGOL", ALGOL Bulletin, Number 24 pp. 13 - 17.
- ^ Stanford Computer Science Department Technical Report CS-TR-68-89 (頁面存檔備份,存於網際網路檔案館) (Various documents for Stanford University's 1972 implementation of ALGOL W; this report includes the ALGOL W Language Description.)
- ^ PL360(REVISED) A PROGRAMMING LANGUAGE FOR THE IBM 360. (PDF). [2020-05-16]. (原始內容存檔 (PDF)於2016-03-04).
外部連結
[編輯]- aw2c – ALGOL W compiler for Linux
- awe(頁面存檔備份,存於網際網路檔案館) – aw2c updated version
- ALGOL W @ Everything2 (頁面存檔備份,存於網際網路檔案館) – informal but detailed description of the language by a former user, with sidebars extolling ALGOL W over Pascal as an educational programming language
- 1969 ALGOL W compiler listing(頁面存檔備份,存於網際網路檔案館) at bitsavers.org
- The Michigan Terminal System Manuals, Volume 16: ALGOL W in MTS(頁面存檔備份,存於網際網路檔案館)
- Algol W materials(頁面存檔備份,存於網際網路檔案館) More than 200 Algol W programs and documentation