Group:
type declaration
Topic:
constants
Topic:
default exception handler
Topic:
initialization of data
Topic:
notation for declarations
Topic:
knowledge representation
Topic:
programming with forms
Topic:
pronoun reference
Topic:
undefined, null, and other signal values
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Summary
Defaults simplify the user's job by predefining his most likely choice. In parameterized type declaration, defaults provide reasonable parameters for the unknowledgeable user. As the user progresses he only needs to learn those parameters he will use. The same goes with command input and procedure calling. Format control often has defaults for the user who just wants a listing. Variables can be zeroed after use. Fill-in forms frequently contain defaults to simplify input. A good default for all user input is the user's previous input.
Program defaults, such as FORTRAN's data typing characters, can often be modified by the user; but default modification implicitly modifies the program's behavior. This is a general weakness of defaults which suggests limiting defaults to user input and unmodifiable defaults. (cbb 5/80)
Subtopic: default frame 
| Quote: if a frame's slots can not be assigned according to its conditions; the network provides a replacement frame [»minsM_1981]
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Subtopic: zero as default
| QuoteRef: seedH_1971 ;;67 all fields with default of zero or blank
| | QuoteRef: seedH_1971 ;;99 can specify fields are emptied after printing
| | QuoteRef: sammJE_1969 ;;452 TRAC #(cl, n, z) calls string n from current location to next segment gap. if n is empty has value of z
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Subtopic: specified default
| QuoteRef: cbb_1973 ;;12/2/76 MERLIN cluster Random: MODULE seed: PAR in rationals ... seed: default-value ... then r: RANDOM (seed:123) overrides
| | QuoteRef: earlJ4_1974 ;;35 func ({1..m},{1..n}, real<-0) is a real n X m array with default 0
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Subtopic: defaults prevail in security
| Quote: most users maintain their privacy defaults as shipped; most users think the default is correct [»paleL12_1997]
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Subtopic: inheritance not good for defaults
Quote: using IS-A links for default properties is insufficient for complex concepts and interacts badly with cancellation
[»bracRJ10_1983]
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Related Topics
Group: type declaration (5 topics, 110 quotes)
Topic: constants (21 items)
Topic: default exception handler (3 items)
Topic: initialization of data (45 items)
Topic: notation for declarations (20 items)
Topic: knowledge representation (41 items)
Topic: programming with forms (26 items)
Topic: pronoun reference (23 items)
Topic: undefined, null, and other signal values
(34 items)
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