www.delorie.com/gnu/docs/guile/guile_191.html   search  
 
Buy GNU books!


Guile Reference Manual

[ < ] [ > ]   [ << ] [ Up ] [ >> ]         [Top] [Contents] [Index] [ ? ]

21.4.5 String Selection

Portions of strings can be extracted by these procedures. string-ref delivers individual characters whereas substring can be used to extract substrings from longer strings.

Scheme Procedure: string-length string
C Function: scm_string_length (string)
Return the number of characters in string.

Scheme Procedure: string-ref str k
C Function: scm_string_ref (str, k)
Return character k of str using zero-origin indexing. k must be a valid index of str.

Scheme Procedure: string-copy str
C Function: scm_string_copy (str)
Return a newly allocated copy of the given string.

Scheme Procedure: substring str start [end]
C Function: scm_substring (str, start, end)
Return a newly allocated string formed from the characters of str beginning with index start (inclusive) and ending with index end (exclusive). str must be a string, start and end must be exact integers satisfying:

0 <= start <= end <= (string-length str).


  webmaster     delorie software   privacy  
  Copyright 2003   by The Free Software Foundation     Updated Jun 2003