Intel® Fortran Compiler 16.0 User and Reference Guide

DOUBLE COMPLEX

Statement: Specifies the DOUBLE COMPLEX data type.

DOUBLE COMPLEX

A COMPLEX(8) or DOUBLE COMPLEX constant is a pair of constants that represents a complex number. One of the pair must be a double-precision real constant, the other can be an integer, single-precision real, or double-precision real constant.

A COMPLEX(8) or DOUBLE COMPLEX constant occupies 16 bytes of memory and is interpreted as a complex number.

The rules for DOUBLE PRECISION (REAL(8)) constants also apply to the double precision portion of COMPLEX(KIND=8) or DOUBLE COMPLEX constants. (For more information, see REAL and DOUBLE PRECISION.)

The DOUBLE PRECISION constants in a COMPLEX(8) or DOUBLE COMPLEX constant have IEEE* T_floating format.

Example

DOUBLE COMPLEX vector, arrays(7,29)
DOUBLE COMPLEX pi, pi2 /3.141592654,6.283185308/
Valid COMPLEX(8) or DOUBLE COMPLEX constants

(547.3E0_8,-1.44_8)

(1.7039E0,-1.7039D0)

(+12739D3,0.D0)
Invalid COMPLEX(8) or DOUBLE COMPLEX constants

(1.23D0,)

Second constant missing.

(1D1,2H12)

Hollerith constants not allowed.

(1,1.2)

Neither constant is DOUBLE PRECISION; this is a valid single-precision real constant.
Parent topic: C to D

See Also

General Rules for Complex Constants
COMPLEX Statement
Complex Data Types
DOUBLE PRECISION
REAL