c/numeric/complex/cabs

@1-3@ Computes the complex absolute value (also known as norm, modulus, or magnitude) of. @4@ Type-generic macro: if has type  or,  is called. If  has type  or,  is called. If has type  or,  is called. For real and integer types, the corresponding version of fabs is called.

Return value
If no errors occur, returns the absolute value (norm, magnitude) of.

Errors and special cases are handled as if the function is implemented as