### 3.1.3.1 General Rules for Complex Constants

A complex constant approximates the value of a mathematical complex number. The constant is a pair of real or integer values, separated by a comma, and enclosed in parentheses. The first constant represents the real part of that number; the second constant represents the imaginary part.

The following is the general form of a complex constant:

  (c,c)
  c
  Is as follows:
  - For COMPLEX(4) constants, c is an integer or REAL(4) constant.
  - For COMPLEX(8) constants, c is an integer, REAL(4) constant, or DOUBLE PRECISION (REAL(8)) constant. At least one of the pair must be DOUBLE PRECISION.
  - For COMPLEX(16) constants (VMS, U*X), c is an integer, REAL(4) constant, REAL(8) constant, or REAL(16) constant. At least one of the pair must be a REAL(16) constant.

Note that the comma and parentheses are required.

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