exp2d32(), exp2d64(), exp2d128() — Calculate the base-2 exponential

Standards

Standards / Extensions	C or C++	Dependencies
C/C++ DFP	both	z/OS® V1.11

Format

#define __STDC_WANT_DEC_FP__
#include <math.h>

_Decimal32  exp2d32(_Decimal32 x); 
_Decimal64  exp2d64(_Decimal64 x); 
_Decimal128 exp2d128(_Decimal128 x); 

_Decimal32  exp2(_Decimal32 x);      /* C++ only */
_Decimal64  exp2(_Decimal64 x);      /* C++ only */
_Decimal128 exp2(_Decimal128 x);     /* C++ only */

General description

The exp2() functions compute the base-2 exponential of x.

Notes:

These functions work in IEEE decimal floating-point format. See IEEE decimal floating-pointIEEE Decimal Floating-Point for more information.
To use IEEE decimal floating-point, the hardware must have the Decimal Floating-Point Facility installed.

Returned value

The exp2() functions return 2 to the power x.

Example

⁄* CELEBE14

   This example illustrates the exp2d128() function.

*⁄

#define  __STDC_WANT_DEC_FP__
#include <math.h>
#include <stdio.h>

void main(void)
{
   _Decimal128 x, y;

   x = 4.785DL;
   y = exp2d128(x);

   printf("exp2d128(%DDf) = %DDf\n", x, y);
}

Related information

math.h