double complex conj(double complex z);
float complex conjf(float complex z);
long double complex conjl(long double complex z);
Link with -lm.
The conj() function returns the complex conjugate value of z. That is
the value obtained by changing the sign of the imaginary part.
cabs(z) = csqrt(z * conj(z))
These functions first appeared in glibc in version 2.1.
cabs(3), csqrt(3), complex(7)
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