Get real part of a complex number
double creal(double complex z);
float crealf(float complex z);
long double creall(long double complex z);
Link with -lm.
The creal() function returns the real part of the complex number z.
z = creal(z) + I * cimag(z)
These functions first appeared in glibc in version 2.1.
The creal(), crealf(), and creall() functions are thread-safe.
The gcc supports also __real__. That is a GNU extension.
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