6.2.18 casin Function

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

Include

<complex.h>

Prototype

double complex casin(double complex z);

Argument

z

value for which to return the complex arc sine

Return Value

Returns the complex arc sine of z with no bound along the imaginary axis, in the interval $\mathrm{[-\pi /2,\; +\pi /2]}$ along the real axis, and with branch cuts outside the interval $\mathrm{[-1,\; +1]}$ along the real axis.

Example

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 = casin(x);
  printf("The complex arcsine of %f + %fi is %f + %fi\n", creal(x), cimag(x), creal(y), cimag(y));
}

Example Output

The complex arcsin of -2.000000 + 0.000000i is -1.570796 + 1.316958i