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islessequal (3)
  • islessequal (3) ( Solaris man: Библиотечные вызовы )
  • islessequal (3) ( FreeBSD man: Библиотечные вызовы )
  • islessequal (3) ( Русские man: Библиотечные вызовы )
  • islessequal (3) ( Linux man: Библиотечные вызовы )
  • >> islessequal (3) ( POSIX man: Библиотечные вызовы )
  •  

    NAME

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

    SYNOPSIS

    #include <math.h>

    int islessequal(real-floating x, real-floating y);
     

    DESCRIPTION

    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 IEEE Std 1003.1-2001 defers to the ISO C standard.

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

    RETURN VALUE

    Upon successful completion, the islessequal() macro shall return the value of (x) <= (y).

    If x or y is NaN, 0 shall be returned.  

    ERRORS

    No errors are defined.

    The following sections are informative.  

    EXAMPLES

    None.  

    APPLICATION USAGE

    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, real-floating indicates that the argument shall be an expression of real-floating type.  

    RATIONALE

    None.  

    FUTURE DIRECTIONS

    None.  

    SEE ALSO

    isgreater() , isgreaterequal() , isless() , islessgreater() , isunordered() , the Base Definitions volume of IEEE Std 1003.1-2001 <math.h>  

    COPYRIGHT

    Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications 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 Standard, 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 .


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    EXAMPLES
    APPLICATION USAGE
    RATIONALE
    FUTURE DIRECTIONS
    SEE ALSO
    COPYRIGHT


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