Literals

Literals are direct representations of variable values.

A numerical literal is a decimal number or a number with a certain base (e.g. binary). The underscore “_” character, inserted between the numbers in a numerical literal, is not relevant.

Literal	Example
Integer number	-12, 0, 123_4, +986
Floating point number	0.0, 0.4560, 3.14159_26
Floating point number with an exponent	-1.34E-12, -1.34e-12
Binary number	2#1111_1111 (255 decimal)
Octal number	8#377 (255 decimal)
Hexadecimal number	16#FF, 16#ff (255 decimal)
Boolean number	0, 1, FALSE, TRUE
Typed number	INT#-123, WORD#16#AEF, BOOL#0, BOOL#FALSE

Note: In FUPLA, literals in other numeric systems than decimal, such as 16#FF, are not supported. All values must be entered as decimal, e.g. 255.

Examples:

REAL#+INF, REAL#-INF, LREAL#+INF, LREAL#-INF //literals of special values of real numbers (+- infinity)
REAL#NAN, LREAL#NAN //literals of special values of real numbers (not a number)

Character literals are one- or two bytes coded characters. A one-byte literal is a sequence of zero or more characters with a prefix and ending using a single quote character ('). A two-byte literal is a sequence of zero or more characters with a prefix and ending using a single quote character (“).

	Literal	Example
One-byte characters	Empty string	''
	One character	'A'
	Typed string	STRING#'OK'
Two-byte characters	Empty string	”“
	One character	“A”
	Typed string	STRING#“OK”
Combinations of two characters	Dollar sign	$$
	Apostroph	$'
	Quotation mark	$”
	Line feed (new line, 16#0A)	$L or $I
	Newline (new line)	$N
	Form feed (new page)	$P
	Carriage return (16#0D)	$R
	Tabelator (16#09)	$T

Time literals represent a duration of an event, or time period elapsed between start and end of an event. Units are days, hours, minutes, seconds, fractions of seconds, and combinations of the above.

Literal	Description
d	Day
h	Hour
m	Minute
s	Second
ms	Millisecond
us	Microsecond
ns	Nanosecond

Examples:

T#14ms, TIME#14ms, T#-14ms, LT#14.7s, t#25h15m, TIME#5m_20s_500ms

Literal	Example
Date	DATE#1984-06-25, date#1984-06-25, D#1984-06-25, d#1984-06-25
Time of day	TIME_OF_DAY#15:36:55.36, TOD#15:36:55.36
Date and time	DATE_AND_TIME#1984-06-25-15:36:55.360227400, DT#1984-06-25-15:36:55.360227400

Literals

Numerical literals

Character literals

Time literals

Time literals of absolute time