__atanpid32(), __atanpid64(), __atanpid128() - Calculate arctangent(x)/pi

Standards

Format

#define __STDC_WANT_DEC_FP__
#include <math.h>

_Decimal32  __atanpid32(_Decimal32 x);
_Decimal64  __atanpid64(_Decimal64 x);
_Decimal128 __atanpid128(_Decimal128 x);

General description

Calculates the value of arctangent(x)/pi.

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

Returned value

Returns the calculated value expressed in radians.

Example

CELEBA17

⁄* CELEBA17

   This example illustrates the __atanpid64() function.

*⁄

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

int main(void)
{
   _Decimal64 x, y;

   x = 5.0DD;
   y = __atanpid64(x);

   printf("__atanpid64(%Df) = %Df\n", x, y);
}

Related information

• math.h
• __cospid32(), __cospid64(), __cospid128() — Calculate cosine of pi *x
• __sinpid32(), __sinpid64(), __sinpid128() — Calculate sine of pi * x