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ISLESS(3P) POSIX Programmer's Manual ISLESS(3P)PROLOGThis manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may dif- fer (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.NAMEisless - test if x is less than ySYNOPSIS#include<math.h>intisless(real-floatingx,real-floatingy);DESCRIPTIONTheisless() macro shall determine whether its first argument is less than its second argument. The value ofisless(x,y) shall be equal to (x) < (y); however, unlike (x) < (y),isless(x,y) shall not raise the invalid floating-point exception whenxandyare unordered.RETURNVALUEUpon successful completion, theisless() macro shall return the value of (x) < (y). Ifxoryis NaN, 0 shall be returned.ERRORSNo errors are defined.Thefollowingsectionsareinformative.EXAMPLESNone.APPLICATIONUSAGEThe relational and equality operators support the usual mathematical relationships between numeric values. For any ordered pair of numeric values, exactly one of the relationships (less, greater, and equal) is true. Rela- tional operators may raise the invalid floating-point exception when argument values are NaNs. For a NaN and a numeric value, or for two NaNs, just the unordered relationship is true. This macro is a quiet (non-floating- point exception raising) version of a relational operator. It facilitates writing efficient code that accounts for NaNs without suffering the invalid floating-point exception. In the SYNOPSIS section,real-floatingindi- cates that the argument shall be an expression ofreal-floatingtype.RATIONALENone.FUTUREDIRECTIONSNone.SEEALSOisgreater(),isgreaterequal(),islessequal(),islessgreater(),isunordered(), the Base Definitions volume of IEEE Std 1003.1-2001,<math.h>COPYRIGHTPortions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Stan- dard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifica- tions Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Stan- dard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html . IEEE/The Open Group 2003 ISLESS(3P)