ccosf, ccos, ccosl

 

C

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Numerics

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Complex number arithmetic

Types and the imaginary constant
complex Complex_I CMPLX	imaginary Imaginary_I I
Manipulation
cimag creal carg	conj cproj
Power and exponential functions
cexp clog	cpow csqrt
Trigonometric functions
ccos csin ctan	cacos casin catan
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ccosh csinh ctanh	cacosh casinh catanh

 

Defined in header <complex.h>
float complex       ccosf( float complex z );		(since C99)
double complex      ccos( double complex z );		(since C99)
long double complex ccosl( long double complex z );		(since C99)

Computes the complex cosine of z.

Parameters

z

-

complex argument

Return value

The complex cosine of z.

Example

Run this code

#include <stdio.h>
#include <complex.h>
#include <math.h>
 
#define PI acos(-1)
 
int main(void)
{
    double complex z;
    double x;
 
    /* Print familiar values. */
    int ndx;
    printf("            cos(x)          ccos(z)\n");
    printf("           --------    ------------------\n");
    for (ndx=0;ndx<9;ndx++) {
        x = ndx*0.25*PI;
        z = x+0.0*I;
        z = ccos(z);
        printf("%.2f*PI   %9f   %9f%+fi\n", ndx*0.25,cos(x),creal(z),cimag(z));
    }
 
    return 0;
}

Output:

cos(x)          ccos(z)
           --------    ------------------
0.00*PI    1.000000    1.000000-0.000000i
0.25*PI    0.707107    0.707107-0.000000i
0.50*PI    0.000000    0.000000-0.000000i
0.75*PI   -0.707107   -0.707107-0.000000i
1.00*PI   -1.000000   -1.000000-0.000000i
1.25*PI   -0.707107   -0.707107+0.000000i
1.50*PI   -0.000000   -0.000000+0.000000i
1.75*PI    0.707107    0.707107+0.000000i
2.00*PI    1.000000    1.000000+0.000000i

See also

csincsinfcsinl (C99)(C99)(C99)	computes the complex sine (function)
ctanctanfctanl (C99)(C99)(C99)	computes the complex tangent (function)
cacoscacosfcacosl (C99)(C99)(C99)	computes the complex arc cosine (function)
coscosfcosl (C99)(C99)	computes cosine (cos(x)) (function)
C++ documentation for cos