80 lines
2.9 KiB
HTML
80 lines
2.9 KiB
HTML
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<head>
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<title>nan(3) - Plan 9 from User Space</title>
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<meta content="text/html; charset=utf-8" http-equiv=Content-Type>
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</head>
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<body bgcolor=#ffffff>
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<table border=0 cellpadding=0 cellspacing=0 width=100%>
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<tr height=10><td>
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<tr><td width=20><td>
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<tr><td width=20><td><b>NAN(3)</b><td align=right><b>NAN(3)</b>
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<tr><td width=20><td colspan=2>
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<br>
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<p><font size=+1><b>NAME </b></font><br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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NaN, Inf, isNaN, isInf – not-a-number and infinity functions<br>
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</table>
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<p><font size=+1><b>SYNOPSIS </b></font><br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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<tt><font size=+1>#include <u.h><br>
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#include <libc.h>
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<table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
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</font></tt>
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<tt><font size=+1>double NaN(void)
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<table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
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</font></tt>
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<tt><font size=+1>double Inf(int)
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<table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
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</font></tt>
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<tt><font size=+1>int isNaN(double)
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<table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
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</font></tt>
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<tt><font size=+1>int isInf(double, int)<br>
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</font></tt>
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</table>
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<p><font size=+1><b>DESCRIPTION </b></font><br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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The IEEE floating point standard defines values called ‘not-a-number’
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and positive and negative ‘infinity’. These values can be produced
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by such things as overflow and division by zero. Also, the library
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functions sometimes return them when the arguments are not in
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the domain, or the result is out of range.
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<table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
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<i>NaN</i> returns a double that is not-a-number. <i>IsNaN</i> returns true
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if its argument is not-a-number.
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<table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
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<i>Inf</i>(<i>i</i>) returns positive infinity if <i>i</i> is greater than or equal
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to zero, else negative infinity. <i>IsInf</i> returns true if its first
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argument is infinity with the same sign as the second argument.<br>
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</table>
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<p><font size=+1><b>SOURCE </b></font><br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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<tt><font size=+1>/usr/local/plan9/src/lib9/nan.c<br>
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</font></tt>
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</table>
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<td width=20>
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<tr height=20><td>
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</table>
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<!-- TRAILER -->
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<table border=0 cellpadding=0 cellspacing=0 width=100%>
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<tr height=15><td width=10><td><td width=10>
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<tr><td><td>
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<center>
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<a href="../../"><img src="../../dist/spaceglenda100.png" alt="Space Glenda" border=1></a>
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</center>
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</table>
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<!-- TRAILER -->
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</body></html>
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