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| <tr><td width=20><td><b>NAN(3)</b><td align=right><b>NAN(3)</b> |
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| <p><font size=+1><b>NAME </b></font><br> |
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| NaN, Inf, isNaN, isInf – not-a-number and infinity functions<br> |
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| <p><font size=+1><b>SYNOPSIS </b></font><br> |
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| <tt><font size=+1>#include <u.h><br> |
| #include <libc.h> |
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| <tt><font size=+1>double NaN(void) |
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| <tt><font size=+1>double Inf(int) |
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| <tt><font size=+1>int isNaN(double) |
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| <tt><font size=+1>int isInf(double, int)<br> |
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| <p><font size=+1><b>DESCRIPTION </b></font><br> |
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| The IEEE floating point standard defines values called ‘not-a-number’ |
| and positive and negative ‘infinity’. These values can be produced |
| by such things as overflow and division by zero. Also, the library |
| functions sometimes return them when the arguments are not in |
| the domain, or the result is out of range. |
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| <i>NaN</i> returns a double that is not-a-number. <i>IsNaN</i> returns true |
| if its argument is not-a-number. |
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| <i>Inf</i>(<i>i</i>) returns positive infinity if <i>i</i> is greater than or equal |
| to zero, else negative infinity. <i>IsInf</i> returns true if its first |
| argument is infinity with the same sign as the second argument.<br> |
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| <p><font size=+1><b>SOURCE </b></font><br> |
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| <tt><font size=+1>/usr/local/plan9/src/lib9/nan.c<br> |
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