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<title>strncpy function</title>
<head>
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<center>
<h1>strtok function</h1>
</center>
<hr>
<p>
All the books that I have read, say that strtok will break a string
into tokens. This is true, but a more obvious
explanation is, that it will break a string into <b>words</b>.
<p>
<hr>
<pre>
Library: string.h
Prototype: char * strtok(char *s, const char *delim);
Syntax: char string []="abc def ghi";
char * word;
word=strtok(string, " ");
word=strtok(NULL, " ");
</pre>
<b>strtok</b> requires a string and the word delimiters, for example:
<pre>
word = strtok(string, " ");
A A
| |
| ------- Delimiters.
|
-------------- String to break up.
</pre>
After the first call to strtok, word will point to <b>abc</b> on the second
call, word will point to <b>def</b>
<p>
<hr>
<h2>Notes:</h2>
<ul>
<li>strtok will alter the I/P string by placing
<a href="../SYNTAX/null.html">NULLS</a> at the delimiter
positions. A good habit is to <a href="../FUNCTIONS/strcpy.html">copy</a>
the string to a tempary string
and use the copy in the strtok call.
<p>
<li>More than one delimiter can be specified. So you could code:
<pre>
word = strtok(string, " <a href="../FUNCTIONS/escape.html">\t</a>;:,");
</pre>
<li>You do not have to include \0 or <a href=../SYNTAX/null.html>NULL</a>
</ul>
<hr>
<h2>Examples:</h2>
<img src=../../GRAPHICS/computer.gif>
<a href="../EXAMPLES/strtok.c"> Example program.</a>
<hr>
<h2>See also:</h2>
<dt><a href="strcpy.html">strcpy</a>
<dt><a href="strncpy.html">strncpy</a>
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<address>Martin Leslie
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