Get real value from real-time systems

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Old 01-14-2008
Get real value from real-time systems

by Cath Jennings, ComputerWeekly.comA few years ago, everyone was talking about the real-time enterprise and how it was destined to be the future. The idea was that companies would be instantaneously aware of any important business events taking place so that they could respond appropriately and immediately.But that has not happened because of both the [...]

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ISGREATER(3)						   BSD Library Functions Manual 					      ISGREATER(3)

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() takes arguments x and y and returns 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, returning non-zero if either x or y is NaN. 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''). BSD
December 1, 2008 BSD