ISLESSEQUAL(3)             POSIX Programmer's Manual            ISLESSEQUAL(3)



PPRROOLLOOGG
       This manual page is part of the POSIX Programmer's Manual.  The OS
       implementation of this interface may differ (consult the corresponding
       OS manual page for details of OS behavior), or the interface may not be
       implemented on OS.


NNAAMMEE
       islessequal -- test if x is less than or equal to y

SSYYNNOOPPSSIISS
       #include <math.h>

       int islessequal(real-floating _x, real-floating _y);

DDEESSCCRRIIPPTTIIOONN
       The functionality described on this reference page is aligned with the
       ISO C standard. Any conflict between the requirements described here
       and the ISO C standard is unintentional. This volume of POSIX.1-2008
       defers to the ISO C standard.

       The _i_s_l_e_s_s_e_q_u_a_l() macro shall determine whether its first argument is
       less than or equal to its second argument. The value of _i_s_l_e_s_s_e_q_u_a_l(_x,
       _y) shall be equal to (_x) <= (_y); however, unlike (_x) <= (_y),
       _i_s_l_e_s_s_e_q_u_a_l(_x, _y) shall not raise the invalid floating-point exception
       when _x and _y are unordered.

RREETTUURRNN VVAALLUUEE
       Upon successful completion, the _i_s_l_e_s_s_e_q_u_a_l() macro shall return the
       value of (_x) <= (_y).

       If _x or _y is NaN, 0 shall be returned.

EERRRROORRSS
       No errors are defined.

       _T_h_e _f_o_l_l_o_w_i_n_g _s_e_c_t_i_o_n_s _a_r_e _i_n_f_o_r_m_a_t_i_v_e_.

EEXXAAMMPPLLEESS
       None.

AAPPPPLLIICCAATTIIOONN UUSSAAGGEE
       The 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. Relational 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, rreeaall--ffllooaattiinngg indicates that the argument shall be an
       expression of rreeaall--ffllooaattiinngg type.

RRAATTIIOONNAALLEE
       None.

FFUUTTUURREE DDIIRREECCTTIIOONNSS
       None.

SSEEEE AALLSSOO
       _i_s_g_r_e_a_t_e_r(), _i_s_g_r_e_a_t_e_r_e_q_u_a_l(), _i_s_l_e_s_s(), _i_s_l_e_s_s_g_r_e_a_t_e_r(), _i_s_u_n_o_r_d_e_r_e_d()

       The Base Definitions volume of POSIX.1-2008, <<mmaatthh..hh>>

CCOOPPYYRRIIGGHHTT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open Group.  (This is
       POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
       event of any discrepancy between this version and the original IEEE and
       The Open Group Standard, the original IEEE and The Open Group Standard
       is the referee document. The original Standard can be obtained online
       at http://www.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .



IEEE/The Open Group                  2013                       ISLESSEQUAL(3)
