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isnan

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Defined in header <math.h>
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#define isnan(arg) /* implementation defined */
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<td class="t-dcl-nopad"> </td> <td > (since C99) </td> </tr> Template:ddcl list end

Determines if the given floating point number arg is not-a-number (NaN). The macro returns an integral value.

Parameters

arg - floating point value

Return value

Nonzero integral value if arg is NaN, 0 otherwise.

See also

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