HP-UX Reference (11i v1 05/09) - 3 Library Functions A-M (vol 6)

exp2(3M) exp2(3M)

NAME

exp2() - base-2 exponential function

SYNOPSIS

#include <math.h>

double exp2(double x);

DESCRIPTION

exp2() returns 2

The ISO/ANSI C committee has approved the

exp2() function for inclusion in the C9X draft standard.

To use this function, compile either with the default

-Ae option or with the -Aa and -D_HPUX_SOURCE

options. Make sure your program includes <

math.h>. Link in the math library by specifying -lm on the

compiler or linker command line.

RETURN VALUE

If x is +INFINITY,

exp2() returns +INFINITY.

If x is −INFINITY,

exp2() returns +zero.

If x is NaN, exp2() returns NaN.

If the correct value after rounding would be smaller in magnitude than MINDOUBLE, exp2() returns

zero.

If the magnitude of x is too large,

exp2() returns +INFINITY.

ERRORS

No errors are deﬁned.