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There is a double-complex version of each complex built-in function. Generally, the specific function names begin with Z or CD instead of C, except for the two functions, DIMAG and DREAL, which return a real value. Examples are: SIN(), CSIN(), CDSIN().

Example: Double-complex scalars and arrays:

       DOUBLE COMPLEX U, V 
       DOUBLE COMPLEX W(3,6) 
       COMPLEX*16 X, Y(5,5)
       COMPLEX  U*16(5), V(5)*16