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    Command:

    powl

    
    
    

    SYNOPSIS

           #include <math.h>
    
           double pow(double x, double y);
           float powf(float x, float y);
           long double powl(long double x, long double y);
    
           Link with -lm.
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
           powf(), powl():
               _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
               _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
               or cc -std=c99
    
    
    

    DESCRIPTION

           The pow() function returns the value of x raised to the power of y.
    
    
    

    RETURN VALUE

           On success, these functions return the value of x to the power of y.
    
           If x is a finite value less than 0, and y is  a  finite  noninteger,  a
           domain error occurs, and a NaN is returned.
    
           If the result overflows, a range error occurs, and the functions return
           HUGE_VAL, HUGE_VALF, or HUGE_VALL, respectively,  with  the  mathemati-
           cally correct sign.
    
           If  result  underflows, and is not representable, a range error occurs,
           and 0.0 is returned.
    
           Except as specified below, if x or y is a NaN, the result is a NaN.
    
           If x is +1, the result is 1.0 (even if y is a NaN).
    
           If y is 0, the result is 1.0 (even if x is a NaN).
    
           If x is +0 (-0), and y is an odd integer greater than 0, the result  is
           +0 (-0).
    
           If  x  is 0, and y greater than 0 and not an odd integer, the result is
           +0.
    
           If x is -1, and y is positive infinity or negative infinity, the result
           is 1.0.
    
           If  the absolute value of x is less than 1, and y is negative infinity,
           the result is positive infinity.
    
           If the absolute value of x is greater than 1, and y is negative  infin-
           ity, the result is +0.
           result is negative infinity.
    
           If x is negative infinity, and y greater than 0 and not an odd integer,
           the result is positive infinity.
    
           If x is positive infinity, and y less than 0, the result is +0.
    
           If x is positive infinity, and y greater than 0, the result is positive
           infinity.
    
           If x is +0 or -0, and y is an odd integer less than  0,  a  pole  error
           occurs  and  HUGE_VAL,  HUGE_VALF,  or HUGE_VALL, is returned, with the
           same sign as x.
    
           If x is +0 or -0, and y is less than 0 and not an odd integer,  a  pole
           error occurs and +HUGE_VAL, +HUGE_VALF, or +HUGE_VALL, is returned.
    
    
    

    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:
    
           Domain error: x is negative, and y is a finite noninteger
                  errno is set  to  EDOM.   An  invalid  floating-point  exception
                  (FE_INVALID) is raised.
    
           Pole error: x is zero, and y is negative
                  errno  is set to ERANGE (but see BUGS).  A divide-by-zero float-
                  ing-point exception (FE_DIVBYZERO) is raised.
    
           Range error: the result overflows
                  errno is set to ERANGE.  An  overflow  floating-point  exception
                  (FE_OVERFLOW) is raised.
    
           Range error: the result underflows
                  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.
    
    
    

    BUGS

           In  glibc  2.9  and  earlier, when a pole error occurs, errno is set to
           EDOM instead of the POSIX-mandated ERANGE.  Since version  2.10,  glibc
           does the right thing.
    
           If  x is negative, then large negative or positive y values yield a NaN
           as the function  result,  with  errno  set  to  EDOM,  and  an  invalid
           (FE_INVALID)  floating-point  exception.   For example, with pow(), one
           sees this behavior when the absolute value of y is greater  than  about
    
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