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

    NAME

    exp, expf, expl - exponential function
     
    

    SYNOPSIS

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

    float expf(float x);
    

    long double expl(long double x);
    

     

    DESCRIPTION

    These functions compute the base-e exponential of x.  

    RETURN VALUES

    Upon successful completion, these functions return the exponential value of x.

    If the correct value would cause overflow, a range error occurs and exp(), expf(), and expl() return HUGE_VAL, HUGE_VALF, and HUGE_VALL, respectively.

    If x is NaN, a NaN is returned.

    If x is ±0, 1 is returned.

    If x is +Inf, x is returned.

    For exceptional cases, matherr(3M) tabulates the values to be returned by exp() as specified by SVID3 and XPG3. See standards(5).  

    ERRORS

    These functions will fail if:

    Range Error

    The result overflows.

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

    The exp() function sets errno to ERANGE if the result overflows.

     

    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.

    An application can also set errno to 0 before calling exp(). On return, if errno is non-zero, an error has occurred. The expf() and expl() functions do not set errno.  

    ATTRIBUTES

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

    ATTRIBUTE TYPEATTRIBUTE VALUE

    Interface StabilityStandard

    MT-Level

     

    SEE ALSO

    feclearexcept(3M), fetestexcept(3M), isnan(3M), log(3M), math.h(3HEAD), matherr(3M), mp(3MP), attributes(5), standards(5)


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    USAGE
    ATTRIBUTES
    SEE ALSO


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