MirOS Manual: isinf(3)

ISINF(3)                   BSD Programmer's Manual                    ISINF(3)

NAME

     isinf - test for infinity

LIBRARY

     libc

SYNOPSIS

     #include <math.h>

     int
     isinf(real-floating x);

DESCRIPTION

     The isinf() macro determines whether its argument x is an infinity (posi-
     tive or negative). An argument represented in a format wider than its se-
     mantic type is converted to its semantic type first. The determination is
     then based on the type of the argument.

IEEE 754

     It is determined whether the value of x is an infinity.

VAX

     Infinities are not supported.

RETURN VALUES

     The isinf() macro returns a non-zero value if the value of x is an infin-
     ity. Otherwise 0 is returned.

SEE ALSO

     fpclassify(3), isfinite(3), isinff(3), isnan(3), isnanf(3), isnormal(3),
     math(3), signbit(3)

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

STANDARDS

     The isinf() macro conforms to ISO/IEC 9899:1999 ("ISO C99").

MirOS BSD #10-current           March 5, 2004                                1

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