tand32(), tand64(), tand128() - Calculate tangent

Standards

Standards / Extensions	C or C++	Dependencies
C/C++ DFP	both	z/OS V1.10

Format

#define __STDC_WANT_DEC_FP__
#include <math.h>

_Decimal32  tand32(_Decimal32 x);
_Decimal64  tand64(_Decimal64 x);
_Decimal128 tand128(_Decimal128 x);
_Decimal32  tan(_Decimal32 x);     /* C++ only */
_Decimal64  tan(_Decimal64 x);     /* C++ only */
_Decimal128 tan(_Decimal128 x);    /* C++ only */

General description

Calculates the tangent of x, where x is expressed in radians. If x is large, a partial loss of significance in the result can occur.

These functions work in IEEE decimal floating-point format. See IEEE decimal floating-point for more information.

Note: To use IEEE decimal floating-point, the hardware must have the Decimal Floating-Point Facility installed.

Returned value

Returns the calculated tangent of x.

If the correct value would cause underflow, zero is returned. If the result overflows, ±HUGE_VAL_D32, ±HUGE_VAL_D64, or ±HUGE_VAL_D128 is returned. For both underflow and overflow, the value ERANGE is stored in errno.

Example

CELEBT22

⁄* CELEBT22

   This example illustrates the tand64() function.

   This example computes x as the tangent of PI⁄4.

*⁄

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

int main(void)
{
   _Decimal64 pi, x;

   pi = 3.1415926DD;
   x = tand64(pi⁄4.0DD);

   printf("tand64( %Df ) is %Df\n", pi⁄4.0DD, x);
}