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    Command:

    expf

    
    
    

    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 || _POSIX_C_SOURCE >= 200112L;
               or cc -std=c99
    
    
    

    DESCRIPTION

           The exp() function returns the value of e (the base  of  natural  loga-
           rithms) 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.
    
    
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