COMPLEX*16 Format A COMPLEX*16 or DOUBLE COMPLEX datum is a processor approximation to the value of a complex number. A COMPLEX*16 datum occupies four consecutive 32-bit words in memory. The real and the imaginary parts are each stored in two words, in the format of a REAL*8 datum. The value of each part is determined as for a REAL*8 datum.Figure 10-8. COMPLEX*16 Format