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Undefined values: Difference between revisions
m
→[[Undefined values#ALGOL 68]]: rename some variables
m (→[[Undefined values#ALGOL 68]]: rename some variables) |
m (→[[Undefined values#ALGOL 68]]: rename some variables) |
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Line 9:
Note: Some implementations (eg [[ALGOL 68C]]) also have a procedure named ''undefined'' that is called to indicated that the behaviour at a particular point in a program is unexpected, undefined, or non-standard.
<lang algol68>MODE R = REF
R r := NIL;
MODE U = UNION(
U u := EMPTY;
Line 24:
(VOID):print(("u is EMPTY", new line))
OUT print(("u isnt EMPTY", new line))
ESAC</lang>
Output:
<pre>
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