Absolute value of a complex number
double cabs(double complex z);
float cabsf(float complex z);
long double cabsl(long double complex z);
Link with -lm.
The cabs() function returns the absolute value of the complex number z. The result is a real number.
These functions first appeared in glibc in version 2.1.
The function is actually an alias for hypot(a, b) (or, equivalently, sqrt(a*a + b*b)).
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