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ISGREATER(3)
ISGREATER(3) FreeBSD Library Functions Manual ISGREATER(3)

NAME

isgreater, isgreaterequal, isless, islessequal, islessgreater, isunorderedcompare two floating-point numbers

LIBRARY

Standard C Library (libc, -lc)

SYNOPSIS

#include < math.h>

int
isgreater( real-floating x, real-floating y);

int
isgreaterequal( real-floating x, real-floating y);

int
isless( real-floating x, real-floating y);

int
islessequal( real-floating x, real-floating y);

int
islessgreater( real-floating x, real-floating y);

int
isunordered( real-floating x, real-floating y);

DESCRIPTION

Each of the macros isgreater(), isgreaterequal(), isless(), islessequal(), and islessgreater() take arguments x and y and return a non-zero value if and only if its nominal relation on x and y is true. These macros always return zero if either argument is not a number (NaN), but unlike the corresponding C operators, they never raise a floating point exception.

The isunordered() macro takes arguments x and y and returns non-zero if and only if neither x nor y are NaNs. For any pair of floating-point values, one of the relationships (less, greater, equal, unordered) holds.

STANDARDS

The isgreater(), isgreaterequal(), isless(), islessequal(), islessgreater(), and isunordered() macros conform to ISO/IEC 9899:1999 (“ISO C99”).

HISTORY

The relational macros described above first appeared in FreeBSD 5.1.
February 12, 2003 FreeBSD