HPUX isinf[3m]

 isinf(3M)                                                         isinf(3M)





 NAME
      isinf(), isinff() - test for INFINITY functions

 SYNOPSIS
      #include <math.h>

      int isinf(double x);

      int isinff(float x);

 DESCRIPTION
      isinf() returns a positive integer if x is +INFINITY, or a negative
      integer if x is -INFINITY.  Otherwise it returns zero.

      isinff() is the float version of isinf().  It is named in accordance
      with the conventions specified in the "Future Library Directions"
      section of the ANSI C standard.  Programs must be compiled in ANSI
      mode (use the -Aa option) in order to use this function; otherwise,
      the compiler promotes the float argument to double, and the function
      returns incorrect results.

 DEPENDENCIES
    Series 300/400
      isinff() is not supported on Series 300/400 systems.

    Series 700/800
      isinff() is provided in the PA1.1 versions of the math library only.
      The +DA1.1 option (the default on Series 700 systems) links in a PA1.1
      version automatically.  A PA1.1 library can be linked in explicitly.
      For more information, see the HP-UX Floating-Point Guide.

 SEE ALSO
      isnan(3M), fpclassify(3M), ieee(3M).





















 Hewlett-Packard Company            - 1 -     HP-UX Release 9.0: August 1992