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#include "__complex.h" // for M_IVLN10
#include <complex.h> // for complex, cabs, cimag, creal, I
#include <math.h> // for atan2, log10
double complex clog10(double complex z)
{
double p, rr;
rr = cabs(z);
p = log10(rr);
rr = atan2(cimag(z), creal(z)) * M_IVLN10;
return p + rr * (double complex)I;
}
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