summaryrefslogtreecommitdiff
path: root/miralib/manual/11
diff options
context:
space:
mode:
authorJakob Kaivo <jkk@ung.org>2022-03-04 12:32:20 -0500
committerJakob Kaivo <jkk@ung.org>2022-03-04 12:32:20 -0500
commit55f277e77428d7423ae906a8e1f1324d35b07a7d (patch)
tree5c1c04703dff89c46b349025d2d3ec88ea9b3819 /miralib/manual/11
import Miranda 2.066 from upstream
Diffstat (limited to 'miralib/manual/11')
-rw-r--r--miralib/manual/1186
1 files changed, 86 insertions, 0 deletions
diff --git a/miralib/manual/11 b/miralib/manual/11
new file mode 100644
index 0000000..5830c60
--- /dev/null
+++ b/miralib/manual/11
@@ -0,0 +1,86 @@
+_L_i_t_e_r_a_l_s
+
+Miranda has three types of literal constant - numerals, character
+constants and string constants.
+
+Numerals are written in the following style
+ 12 5237563 24.6 4.5e13 0.63e-6
+A numeral containing decimal point and/or scale factor (`.' or `e') is
+held internally as double precision (=64 bit) floating point, accuracy
+approximately 17 significant figures. Integers are held in a different
+internal representation, and have unbounded precision.
+
+The two kinds of number, integer and floating point, are both of type
+`num', as far as the type-checker is concerned, and can be freely mixed
+in calculations. There is automatic conversion from integer to float
+when required, but not in the opposite direction. To convert from
+floating point to integer, use `entier' (see standard environment).
+
+Negative numbers are denoted by applying the prefix `-' operator to a
+numeral, thus:
+ -12 -4.5e13
+but note that the notation -12 is an expression, not a literal, so if
+you wish to apply a function to it, you must write f (-12), not f -12,
+which would be read as an attempt to subtract 12 from f.
+
+Integers can be written in hexadecimal (base 16) or octal (base 8)
+notation starting with 0x or 0o, e.g. 4095 can also be written as 0xfff
+or 0o7777. Floating point numbers can be expressed in hexadecimal
+notation, optionally scaled by `p' followed by a power of 2. For
+example 0x1.0p-2 means 0.25.
+
+Character constants are written using single quotes, thus
+ 'a' '0' '\n'
+The type `char' includes all Unicode* characters, those outside ascii
+and Latin-1 can be expressed by numeric escape codes, see below.
+
+Note that the functions code::char->num, decode::num->char convert
+characters to and from their numeric codes.
+
+String constants are written using double quotes, thus
+ "hello dolly" "" "\n\n\n"
+
+Escape conventions in character and string constants are as in `C',
+using the backslash character.
+ \' single quote
+ \" double quote
+ \\ the \ character itself
+ \a alarm
+ \b backspace
+ \f formfeed
+ \n newline
+ \r carriage return
+ \t tab
+ \v vertical tab
+plus these numeric escapes which specify characters by code number.
+ \ddd up to 3 decimal digits [0-9]
+ \xffff up to 4 hex digits [0-9a-f]
+ \Xffffff up to 6 hex digits
+
+For escape codes to \999 you can use either decimal or hex, for example
+the DELETE character can be written as \127 or \x7f. The \x and \X
+forms cover the whole range of Unicode values. For example '\x3b3' is
+the Greek letter lower case gamma and '\x20ac' is the euro sign. The \X
+form is unlikely to be needed but is provided for completeness.
+
+Specifying a character by numeric code in a string or char constant has
+the same effect as including it literally, so for example "£" and
+"\163" are exactly the same string.
+
+Where a numeric escape code in a string is followed by a literal digit
+(or hex digit for \x \X) the numeral can be padded with leading 0s to
+force the correct parse. For example "\0078" is the alarm character \7
+followed by a literal '8', while "\78" is "N".
+
+Literal newlines are allowed inside string quotes if escaped by a
+preceding backslash, in which case the newline is ignored (as in C).
+Thus the string "hello dolly" can equally be written
+ "hello \
+dolly"
+
+A literal newline is not allowed inside character quotes.
+
+[* Unicode is an international standard providing numeric codes for the
+ symbols of practically all known human writing systems. Unicode
+ points 0-127 coincide with ascii and 128-255 with Latin-1.]
+