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Showing content from http://www.lispworks.com/documentation/lw71/CLHS/Body/f_string.htm below:

CLHS: Function STRING

Syntax:

string x => string

Arguments and Values:

x---a string, a symbol, or a character.

string---a string.

Description:

Returns a string described by x; specifically:

• If x is a string, it is returned.
• If x is a symbol, its name is returned.
• If x is a character, then a string containing that one character is returned.
• string might perform additional, implementation-defined conversions.

Examples:

 (string "already a string") =>  "already a string"
 (string 'elm) =>  "ELM"
 (string #\c) =>  "c"

Affected By: None.

Exceptional Situations:

In the case where a conversion is defined neither by this specification nor by the implementation, an error of type type-error is signaled.

See Also:

coerce, string (type).

Notes:

coerce can be used to convert a sequence of characters to a string.

prin1-to-string, princ-to-string, write-to-string, or format (with a first argument of nil) can be used to get a string representation of a number or any other object.

• STRING-COERCION:MAKE-CONSISTENT
• CHARACTER-PROPOSAL:2-1-1

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