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<head>
<title>
C Guide--2.1 assert.h
</title>
<!-- Changed by: eric huss, 12-Mar-1997 -->
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<center>
<table border=0 width=100%>
<tr>
<td align=left width=20% valign=top>
<a href="1.7.html">
<img src="left.gif" border=0>
Previous Section<br>
1.7 Preprocessing Directives</a></td>
<td align=center width=60% valign=top>
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<a href="2.2.html">
Next Section
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2.2 ctype.h</a></td>
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<hr>
<h1>2.1 assert.h</h1>
<p>
The assert header is used for debugging purposes.
<p>
Macros:
<blockquote><code><b>
assert();
</b></code></blockquote>
External References:
<blockquote><code><b>
NDEBUG
</b></code></blockquote>
<a name="assert"></a>
<h2>2.1.1 assert</h2>
<p>
Declaration:
<blockquote><code><b>
void assert(int </b></code><i>expression</i><code><b>);</b></code>
</blockquote>
The assert macro allows diagnostic information to be written to the standard error file.
<p>
If expression evaluates to 0 (false), then the expression, sourcecode filename, and line
number are sent to the standard error, and then calls the abort function. If the identifier
<code><b>NDEBUG</b></code> ("no debug") is defined with <code><b>#define NDEBUG</b></code> then the macro assert does nothing.
<p>
Common error outputting is in the form:
<blockquote><code><b>
Assertion failed:</code></b><i> expression</i><code><b>, file</b></code> <i>filename</i><code><b>, line</b></code><i> line-number</i>
</blockquote>
Example:
<blockquote><code><b><pre>
#include&lt;assert.h&gt;
void open_record(char *record_name)
{
assert(record_name!=NULL);
/* Rest of code */
}
int main(void)
{
open_record(NULL);
}
</pre></b></code></blockquote>
<hr>
<center>
<table border=0 width=100%>
<tr>
<td align=left width=20% valign=top>
<a href="1.7.html">
<img src="left.gif" border=0>
Previous Section<br>
1.7 Preprocessing Directives</a></td>
<td align=center width=60% valign=top>
| <a href="index.html">Table of Contents</a> |
<a href="index2.html">Index</a> |</td>
<td align=right width=20% valign=top>
<a href="2.2.html">
Next Section
<img src="right.gif" border=0><br>
2.2 ctype.h</a></td>
</tr>
</table>
</center>
</body>
</html>