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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 - base-e exponential function
     
    

    SYNOPSIS

    #include <math.h>
    
    double exp(double x);
    
    float expf(float x);
    long double expl(long double x);

    Link with -lm.

    Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

    expf(), expl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; or cc -std=c99  

    DESCRIPTION

    The exp() function returns the value of e (the base of natural logarithms) raised to the power of x.  

    RETURN VALUE

    On success, these functions return the exponential value of x.

    If x is a NaN, a NaN is returned.

    If x is positive infinity, positive infinity is returned.

    If x is negative infinity, +0 is returned.

    If the result underflows, a range error occurs, and zero is returned.

    If the result overflows, a range error occurs, and the functions return +HUGE_VAL, +HUGE_VALF, or +HUGE_VALL, respectively.  

    ERRORS

    See math_error(7) for information on how to determine whether an error has occurred when calling these functions.

    The following errors can occur:

    Range error, overflow
    errno is set to ERANGE. An overflow floating-point exception (FE_OVERFLOW) is raised.
    Range error, underflow
    errno is set to ERANGE. An underflow floating-point exception (FE_UNDERFLOW) is raised.
     

    CONFORMING TO

    C99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD, C89.  

    SEE ALSO

    cbrt(3), cexp(3), exp10(3), exp2(3), sqrt(3)  

    COLOPHON

    This page is part of release 3.14 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    CONFORMING TO
    SEE ALSO
    COLOPHON


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