Topic:
constants
Topic:
data type by lexical constraints
Topic:
data structure literals
Topic:
string literals
| |
Summary
All values, including symbolic expressions, should have a literal representation, which could be user defined. For numeric constants, the number's radix can be specified. Negative integers should have a literal representation distinct from the negation operator. Null values can be specified by contiguous commas, quote marks, or braces. A prefix to a number may indicate its data type (cbb 5/80 12/92)
Subtopic: type indicators 
| Quote: prefix numbers to indicate data type; e.g. FL128 for file 128 records [»buttRA4_1975, OK]
| | Quote: include type indicator with literals [»cbb_1980, OK]
| | Quote: name qualifiers may distinguish quantities have the same type [»simoC8_1991]
|
Subtopic: format specification
| QuoteRef: mckeWM_1966 ;;110 number base radix-- is a string representation of a number
| | QuoteRef: bateF_1970 ;;174 PL/1 has literal format specification
|
Subtopic: null values
| QuoteRef: memorex ;;10-6 contiguous commas (operand deliminators) same as a null value
|
Subtopic: literal expressions
| QuoteRef: morrJH8_1972 ;;757 literal expression by french quotes eg<>
|
Subtopic: negative
| QuoteRef: wileDS11_1973 ;;29 has unique negative integer indicator '~'
|
Subtopic: history of decimal number notation
| Quote: the decimal number system appears to be of Hindu origin sometime before 595 A.D.; only India switched from the old system to the new one using the same numerical signs [»dattB_1935]
| | Quote: India has a place-value system of word numerals; 1 is anything markedly unique, e.g., the moon, the earth; 0 is denoted by words meaning void, sky, complete; still used today [»dattB_1935]
| | Quote: the earliest known use of the zero symbol is by Pingala (before 200 B.C.) [»dattB_1935]
|
Subtopic: history of binary number notation
| Quote: use the 5-bit teleprinter code to represent binary numbers; 0=/, 1=E, 2=@, 3=A; need to memorize [»turiA3_1951]
| | Quote: Turing wrote binary numbers with the low-bit first, divided into blocks of five
| Quote: a large character indicates the same character repeated eight times
|
Related Topics
Topic: constants (21 items)
Topic: data type by lexical constraints (15 items)
Topic: data structure literals (9 items)
Topic: string literals
(3 items)
|
