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lround (3)
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  • lround (3) ( Русские man: Библиотечные вызовы )
  • lround (3) ( Linux man: Библиотечные вызовы )
  • lround (3) ( POSIX man: Библиотечные вызовы )
  •  

    NAME

    lround, lroundf, lroundl - round to nearest integer value
     
    

    SYNOPSIS

    c99 [ flag... ] file... -lm [ library... ]
    #include <math.h>
    
    long lround(double x);
    

    long lroundf(float x);
    

    long lroundl(long double x);
    

     

    DESCRIPTION

    These functions round their argument to the nearest integer value, rounding halfway cases away from zero, regardless of the current rounding direction.  

    RETURN VALUES


     Upon successful completion, these functions return the rounded integer value.

    If x is NaN, a domain error occurs and an unspecified value is returned.

    If x is +Inf, a domain error occurs and an unspecified value is returned.

    If x is -Inf, a domain error occurs and an unspecified value is returned.

    If the correct value is positive and too large to represent as a long, a domain error occurs and an unspecified value is returned.

    If the correct value is negative and too large to represent as a long, a domain error occurs and an unspecified value is returned.  

    ERRORS

    These functions will fail if:

    Domain Error

    The x argument is NaN or ±Inf, or the correct value is not representable as an integer.

    If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, then the invalid floating-point exception is raised.

     

    USAGE

    An application wanting to check for exceptions should call feclearexcept(FE_ALL_EXCEPT) before calling these functions. On return, if fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an exception has been raised. An application should either examine the return value or check the floating point exception flags to detect exceptions.  

    ATTRIBUTES

    See attributes(5) for descriptions of the following attributes:

    ATTRIBUTE TYPEATTRIBUTE VALUE

    Interface StabilityStandard

    MT-Level

     

    SEE ALSO

    feclearexcept(3M), fetestexcept(3M), llround(3M), math.h(3HEAD), attributes(5), standards(5)


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    USAGE
    ATTRIBUTES
    SEE ALSO


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