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### 1.3 Strings

Literal strings must be enclosed in double quotes (") or dollar signs (`$`). With `eukleides`, enclosing characters yield no difference but with `euktopst` dollar signs are taken as part of the string. Literal strings may be split in several lines.

#### Special characters

`%n`

  Newline (LF).

`%r`

  Return (CR).

`%t`

  Tab.

`%"`

  Double quote (when enclosing character).

`%$`

  Dollar sign (when enclosing character).

`%%`

  Percent sign.

#### String related functions

`length(s)`

  Length of string s.

`sub(s, i, j)`

  Substring of string s from index i to j. Indices start at 0.

`cat(list)`

  Concatenates list into a single string, where list is a comma separated sequence of strings, numbers, points or sets. Numbers are formatted using at most 6 digits, with no trailing zeros or decimal point (i.e. the `%g` format for `printf` in C). Points are converted to their Cartesian coordinates. With `eukleides` abscissa and ordinate are simply separated by a white space. With `euktopst` coordinates are formated in the usual mathematical way, using parenthesis and comma.