Ada 2005 Reference Manual
2.6 String Literals
A string_literal is formed by a sequence of graphic characters (possibly none) enclosed between two quotation marks used as string brackets. They are used to represent operator_symbols (see 6.1), values of a string type (see 4.2), and array subaggregates (see 4.3.3).
Syntax
string_element ::= "" | non_quotation_mark_graphic_character
A string_element is either a pair of quotation marks (""), or a single graphic_character other than a quotation mark.
Static Semantics
The sequence of characters of a string_literal is formed from the sequence of string_elements between the bracketing quotation marks, in the given order, with a string_element that is "" becoming a single quotation mark in the sequence of characters, and any other string_element being reproduced in the sequence.
A null string literal is a string_literal with no string_elements between the quotation marks.
NOTES
6 An end of line cannot appear in a string_literal.
7 No transformation is performed on the sequence of characters of a string_literal.
Examples
Examples of string literals:
"Message of the day:"
"" -- a null string literal
" " "A" """" -- three string literals of length 1
"Characters such as $, %, and } are allowed in string literals"
"Archimedes said ""Εύρηκα"""
"Volume of cylinder (πr²h) = "
"" -- a null string literal
" " "A" """" -- three string literals of length 1
"Characters such as $, %, and } are allowed in string literals"
"Archimedes said ""Εύρηκα"""
"Volume of cylinder (πr²h) = "
