4.2.1 Characters and strings
Strings are delimited with quotation marks
(").
A character is a string of length one.
Do not confuse " with ’ which is used to prevent evaluation
of an expression (see Section 8.1.4). For example, "a"
returns a string with one character but ’a’ or
quote(a)
returns the variable a unevaluated.
When a string is entered on a command line, it is evaluated to itself,
hence the output is the same string. You can use + to
concatenate two strings or a string and another object (where the
other object will be converted to a string, see
Section 4.2.11).
Examples
You can refer to a particular character of a string using index
notation, like for lists (see Section 5.3). Indices begin at 0
in Xcas mode, 1 in other modes.
Example