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ISINF(3)	       FreeBSD Library Functions Manual 	      ISINF(3)

NAME
     isinf, isnan, isnanf -- test for infinity or not-a-number

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <math.h>

     int
     isinf(double);

     int
     isnan(double);

     int
     isnanf(float);

DESCRIPTION
     The isinf() function returns 1 if the number is ``infinity'', otherwise
     0.

     The isnan() and isnanf() functions return 1 if the double or float
     (respectively) is ``not-a-number'', otherwise 0.

SEE ALSO
     math(3)

     IEEE Standard for Binary Floating-Point Arithmetic, Std 754-1985, ANSI.

BUGS
     Neither the VAX nor the Tahoe floating point have distinguished values
     for either infinity or not-a-number.  These routines always return 0 on
     those architectures.

FreeBSD 4.9		       January 29, 1994 		   FreeBSD 4.9

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