double complex catan(double complex z);
float complex catanf(float complex z);
long double complex catanl(long double complex z);
次の関係が成立する:
catan(z) = (clog(1 + i * z) - clog(1 - i * z)) / (2 * i)
| インターフェース | 属性 | 値 |
| catan(), catanf(), catanl() | Thread safety | MT-Safe |
#include <complex.h> #include <stdlib.h> #include <unistd.h> #include <stdio.h>
int main(int argc, char *argv[]) {
double complex z, c, f;
double complex i = I;
if (argc != 3) {
fprintf(stderr, "Usage: %s <real> <imag>\n", argv[0]);
exit(EXIT_FAILURE);
}
z = atof(argv[1]) + atof(argv[2]) * I;
c = catan(z);
printf("catan() = %6.3f %6.3f*i\n", creal(c), cimag(c));
f = (clog(1 + i * z) - clog(1 - i * z)) / (2 * i);
printf("formula = %6.3f %6.3f*i\n", creal(f2), cimag(f2));