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cacosf, cacos, cacosl

From cppreference.com
< c‎ | numeric‎ | complex
Defined in header <complex.h>
float complex       cacosf( float complex z );
(since C99)
double complex      cacos( double complex z );
(since C99)
long double complex cacosl( long double complex z );
(since C99)

Computes the complex arc cosine of z with branch cuts outside the interval [−1,+1] along the real axis.

Contents

[edit] Parameters

z - complex argument

[edit] Return value

The complex arc cosine of z in the interval [0; π] along the real axis and in the interval (−∞; ∞) along the imaginary axis.

[edit] Example

#include <stdio.h>
#include <complex.h>
 
int main(void)
{
    double complex z;
 
    z = ccos(1.0+2.0*I);
    printf("ccos(1.0+2.0i)            ==> %f%+fi\n", creal(z),cimag(z));
 
    z = cacos(2.032723-3.051898*I);
    printf("cacos(2.032723-3.051898i) ==> %f%+fi\n", creal(z),cimag(z));
 
    return 0;
}

Output:

ccos(1.0+2.0i)            ==> 2.032723-3.051898i
cacos(2.032723-3.051898i) ==> 1.000000+2.000000i

[edit] See also

(C99)(C99)(C99)
computes the complex arc sine
(function) [edit]
(C99)(C99)(C99)
computes the complex arc tangent
(function) [edit]
(C99)(C99)(C99)
computes the complex cosine
(function) [edit]
(C99)(C99)
computes arc cosine (arccos(x))
(function) [edit]