cacos Function

Calculates the complex arc cosine function of a double precision complex value.

Attention: This function is implemented only by MPLAB XC32 C compilers.




double complex cacos(double complex z);


value for which to return the complex arc cosine

Return Value

Returns the complex arc cosine of z with no bound along the imaginary axis, in the interval [0, π] along the real axis, and with branch cuts outside the interval [-1, +1] along the real axis.


See the notes at the beginning of this chapter or section for information on using printf() or scanf() (and other functions reading and writing the stdin or stdout streams) in the example code.

#include <stdio.h>
#include <complex.h>

int main(void)
  double complex x, y;

  x = -2.0 + 0.0*I;
  y = cacos(x);
  printf("The complex arccosine of %f + %fi is %f + %fi\n", creal(x), cimag(x), creal(y), cimag(y));

Example Output

The complex arccosine of -2.000000 + 0.000000i is 3.141593 + -1.316958i