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| author | Tobias Klauser <tklauser@distanz.ch> | 2008-01-27 11:37:44 +0100 |
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| committer | Tobias Klauser <tklauser@xenon.tklauser.home> | 2008-01-27 11:37:44 +0100 |
| commit | 7e0f021a9aec35fd8e6725e87e3313b101d26f5e (patch) | |
| tree | b1cacc4b24393f517aeb4610e9e1021f954307a8 /reference/C/FUNCTIONS/qsort.html | |
Initial import (2.0.2-6)2.0.2-6
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| -rw-r--r-- | reference/C/FUNCTIONS/qsort.html | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/reference/C/FUNCTIONS/qsort.html b/reference/C/FUNCTIONS/qsort.html new file mode 100644 index 0000000..466cd4e --- /dev/null +++ b/reference/C/FUNCTIONS/qsort.html @@ -0,0 +1,100 @@ +<title>qsort function</title> + +<head> +<script language="JavaScript"> +</script> +</head> + +<body bgcolor="#ffffcc"> +<center> +<hr> +<h1>qsort function</h1> +<hr> +</center> +<p> +<b>qsort</b> will sort an array of elements. This is a wild function that +uses a pointer to another function that performs +the required comparisons. + +<pre> +Library: stdlib.h + +Prototype: void qsort(void *base, + size_t num, + size_t size, + int (*comp_func)(const void *, const void *)) + +</pre> +<hr> +<h2>Some explanation.</h2> +<ul> +<li><pre>void * base</pre> Is a pointer to the array to be sorted. This can +be a pointer to any <a href=../CONCEPT/data_types.html>datatype</a>. +<p> +<li><pre>size_t num</pre> The number of elements. +<p> +<li><pre>size_t size</pre> The element size. +<p> +<li><pre>int (*comp_func)(const void *, const void *))</pre> This is a +pointer to +a function. +</ul> + + +<hr> +<h2>Notes</h2> +<ol> +<li>Well... This caused me alot of trouble! Although the prototype above is +exactly as shown in the documentation, the last parm kept giving compiler +warnings (invalid pointer type) this is the fix. +<pre> + +Prototype: void qsort(void *base, + size_t num, + size_t size, + (void *) (*comp_func)(const void *, const void *)) +</pre> +does anyone know the answer to this problem?? +<p> +<li>I think <a href=../CONCEPT/pointers.html#void>void *</a> needs an explanation. +<p> +<li>And <a href=../CONCEPT/cast.html>cast</a> aswell +<p> +</ol> +<hr> + +<img src=../../GRAPHICS/computer.gif> +<a href=../EXAMPLES/qsort1.c>Example program 1</a> As basic as I can make it.<p> + +<img src=../../GRAPHICS/computer.gif> +<a href=../EXAMPLES/qsort2.c>Example program</a> with user input.<p> + +<img src=../../GRAPHICS/computer.gif> +<a href=../CONTRIB/OR_USING_C/14.2.c>O'Reilly 'Using C' example.</a><p> + + +<p> + +<hr> +<p> +<center> +<table border=2 width="80%" bgcolor="ivory"> +<tr align=center> +<td width="25%"> +<a href="../cref.html"> Top</a> +</td><td width="25%"> +<a href="../master_index.html"> Master Index</a> +</td><td width="25%"> +<a href="../SYNTAX/keywords.html"> Keywords</a> +</td><td width="25%"> +<a href="funcref.htm"> Functions</a> +</td> +</tr> +</table> +</center> +<p> +<hr> +<address>Martin Leslie +</address><p> +</body> +</html> |