Hi，
I saw the following functions in complex.h, but I can't use them in the program. The compiler complains about the unsolved symbol. What is the reason for this? How can I use them?
_Fcomplex (_FCbuild)(float, float);
_Fcomplex (_FCmulcc)(_Fcomplex, _Fcomplex);
_Fcomplex (_FCmulcr)(_Fcomplex, float);
_Fcomplex (_FCdivcc)(_Fcomplex, _Fcomplex);
_Fcomplex (_FCdivcr)(_Fcomplex, float);
_Fcomplex (_FCaddcc)(_Fcomplex, _Fcomplex);
_Fcomplex (_FCaddcr)(_Fcomplex, float);
_Fcomplex (_FCsubcc)(_Fcomplex, _Fcomplex);
_Fcomplex (_FCsubcr)(_Fcomplex, float);
