Manpages - sincos.3

sincos, sincosf, sincosl - calculate sin and cos simultaneously

  #define _GNU_SOURCE /* See feature_test_macros(7) */
  #include <math.h>

  void sincos(double x, double *sin, double *cos);
  void sincosf(float x, float *sin, float *cos);
  void sincosl(long double x, long double *sin, long double *cos);

Link with -lm.

Several applications need sine and cosine of the same angle x. These functions compute both at the same time, and store the results in *sin and *cos. Using this function can be more efficient than two separate calls to *sin*(3) and *cos*(3).

If x is a NaN, a NaN is returned in *sin and *cos.

If x is positive infinity or negative infinity, a domain error occurs, and a NaN is returned in *sin and *cos.

These functions return void.

See *math_error*(7) for information on how to determine whether an error has occurred when calling these functions.

The following errors can occur:

Domain error: x is an infinity

errno is set to EDOM (but see BUGS). An invalid floating-point exception (FE_INVALID) is raised.

These functions first appeared in glibc in version 2.1.

For an explanation of the terms used in this section, see *attributes*(7).

These functions are GNU extensions.

To see the performance advantage of *sincos*(), it may be necessary to disable *gcc*(1) built-in optimizations, using flags such as:

  cc -O -lm -fno-builtin prog.c

Before version 2.22, the glibc implementation did not set errno to EDOM when a domain error occurred.

*cos*(3), *sin*(3), *tan*(3)

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