09-05-2015
Thanks, floating points numbers did it.
Thanks
regards
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LEARN ABOUT FREEBSD
isgreater
ISGREATER(3) BSD Library Functions Manual ISGREATER(3)
NAME
isgreater, isgreaterequal, isless, islessequal, islessgreater, isunordered -- compare 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.
SEE ALSO
fpclassify(3), math(3), signbit(3)
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.
BSD
February 12, 2003 BSD