cacosf, cacos, cacosl

 

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Complex number arithmetic

Types and the imaginary constant
complex Complex_I CMPLX	imaginary Imaginary_I I
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cimag creal carg	conj cproj
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cexp clog	cpow csqrt
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ccos csin ctan	cacos casin catan
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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.

Parameters

z

-

complex argument

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.

Example

Run this code

#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

See also

casincasinfcasinl (C99)(C99)(C99)	computes the complex arc sine (function)
catancatanfcatanl (C99)(C99)(C99)	computes the complex arc tangent (function)
ccosccosfccosl (C99)(C99)(C99)	computes the complex cosine (function)
acosacosfacosl (C99)(C99)	computes arc cosine (arccos(x)) (function)
C++ documentation for acos