EXP16 3CW "07 June 2007" "mathcw-1.00"

Table of contents


NAME

exp16f, exp16, exp16l, exp16w, exp16q, exp16ll, exp16df, exp16d, exp16dl, exp16dll - exponential base-16 function

SYNOPSIS

cc [ flags ] -I/usr/local/include file(s) -L/usr/local/lib -lmcw [ ... ]

#include <mathcw.h>

extern float exp16f (float x);

extern double exp16 (double x);

extern long double exp16l (long double x);

extern __float80 exp16w (__float80 x);

extern __float128 exp16q (__float128 x);

extern long_long_double exp16ll (long_long_double x);

extern decimal_float exp16df (decimal_float x);

extern decimal_double exp16d (decimal_double x);

extern decimal_long_double exp16dl (decimal_long_double x);

extern decimal_long_long_double exp16dll (decimal_long_long_double x);

NB: Functions with prototypes containing underscores in type names may be available only with certain extended compilers.


DESCRIPTION

Compute the base-16 exponential of x, that is, 16 to the power x.

This function may be more accurate than the mathematically-equivalent expression using the power function, such as pow(16.0, x).

Caution: Because the function grows rapidly for arguments of large magnitude, it approaches Infinity fairly quickly. Also, for arguments of small magnitude, exp16(x) - 1 suffers loss of leading significant digits; use the accurate exp16m1(x) function instead.


RETURN VALUES

Return the base-16 exponential of the argument, or a NaN if the argument is a NaN.

ERRORS

If the argument is a NaN, return the argument, and set errno to EDOM. If the argument is large enough that the function value is too large to represent (i.e., it overflows), return Infinity, and set errno to ERANGE.

SEE ALSO

exp(3CW), expm1(3CW), exp2(3CW), exp2m1(3CW), exp8(3CW), exp8m1(3CW), exp10(3CW), exp10m1(3CW), exp16m1(3CW), log(3CW), log1p(3CW), log2(3CW), log21p(3CW), log8(3CW), log81p(3CW), log10(3CW), log101p(3CW), log16(3CW), log161p(3CW).