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Man Pages


Manual Reference Pages  -  ISLESS (3)

NAME

isgreater, isgreaterequal, isless, islessequal, islessgreater, isunordered - compare two floating-point numbers

CONTENTS

Library
Synopsis
Description
See Also
Standards
History

LIBRARY


.Lb libc

SYNOPSIS


.In 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.

SEE ALSO

fpclassify(3), math(3), signbit(3)

STANDARDS

The isgreater, isgreaterequal, isless, islessequal, islessgreater, and isunordered macros conform to -isoC-99.

HISTORY

The relational macros described above first appeared in
.Fx 5.1 .
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