function Cmplx (RealPart, ImaginaryPart: Real): Complex;
Cmplx makes a complex number from RealPart and ImaginaryPart.
Cmplx is an ISO 10206 Extended Pascal extension.
     program CmplxDemo;
     var
       z: Complex;
       x, y: Real;
     begin
       z := Cmplx (x, y)  { z := x + iy }
     end.