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Date:: Fri Jan 14 03:45:44 2005 UTC
Message:: checkpoint
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1 <head>
2 <title>nan(3) - Plan 9 from User Space</title>
3 <meta content="text/html; charset=utf-8" http-equiv=Content-Type>
4 </head>
5 <body bgcolor=#ffffff>
6 <table border=0 cellpadding=0 cellspacing=0 width=100%>
7 <tr height=10><td>
8 <tr><td width=20><td>
9 <tr><td width=20><td><b>NAN(3)</b><td align=right><b>NAN(3)</b>
10 <tr><td width=20><td colspan=2>
11     <br>
12 <p><font size=+1><b>NAME     </b></font><br>
13 
14 <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
15 
16     NaN, Inf, isNaN, isInf &ndash; not-a-number and infinity functions<br>
17     
18 </table>
19 <p><font size=+1><b>SYNOPSIS     </b></font><br>
20 
21 <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
22 
23     <tt><font size=+1>#include &lt;u.h&gt;<br>
24     #include &lt;libc.h&gt; 
25     <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
26     </font></tt>
27     <tt><font size=+1>double NaN(void) 
28     <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
29     </font></tt>
30     <tt><font size=+1>double Inf(int) 
31     <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
32     </font></tt>
33     <tt><font size=+1>int &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;isNaN(double) 
34     <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
35     </font></tt>
36     <tt><font size=+1>int &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;isInf(double, int)<br>
37     </font></tt>
38 </table>
39 <p><font size=+1><b>DESCRIPTION     </b></font><br>
40 
41 <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
42 
43     The IEEE floating point standard defines values called &#8216;not-a-number&#8217;
44     and positive and negative &#8216;infinity&#8217;. These values can be produced
45     by such things as overflow and division by zero. Also, the library
46     functions sometimes return them when the arguments are not in
47     the domain, or the result is out of range. 
48     <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
49     
50     <i>NaN</i> returns a double that is not-a-number. <i>IsNaN</i> returns true
51     if its argument is not-a-number. 
52     <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
53     
54     <i>Inf</i>(<i>i</i>) returns positive infinity if <i>i</i> is greater than or equal
55     to zero, else negative infinity. <i>IsInf</i> returns true if its first
56     argument is infinity with the same sign as the second argument.<br>
57     
58 </table>
59 <p><font size=+1><b>SOURCE     </b></font><br>
60 
61 <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
62 
63     <tt><font size=+1>/usr/local/plan9/src/lib9/nan.c<br>
64     </font></tt>
65 </table>
66 
67 <td width=20>
68 <tr height=20><td>
69 </table>
70 <!-- TRAILER -->
71 <table border=0 cellpadding=0 cellspacing=0 width=100%>
72 <tr height=15><td width=10><td><td width=10>
73 <tr><td><td>
74 <center>
75 <a href="../../"><img src="../../dist/spaceglenda100.png" alt="Space Glenda" border=1></a>
76 </center>
77 </table>
78 <!-- TRAILER -->
79 </body></html>