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We first define a simple real constant as follows:  an optional sign
followed by an integer part followed by a decimal point followed by a
fractional part.  The integer and fractional parts are non-empty strings of
digits.  The fractional part can be omitted.

A real constant has one of the following forms.

(1)
    A simple real constant.

(2)
    A simple real constant followed by an E or e followed by an optionally
    signed integer constant.

The optionally signed integer constant that follows the E is called the
exponent.  The value of a real constant that contains an exponent is the
value of the constant preceding the E multiplied by the power of ten
determined by the exponent.

The following are examples of real constants.


     123.764
     0.4352344
     1423.34E12
     +345.E-4
     -0.4565788E3
     2.E6
     1234.

Note:
    The accepted forms of floating-point constants are a subset of that
    supported by the FORTRAN 77 programming language.  The debugger does not
    support floating-point constants that begin with a decimal point (e.g.,
    .4352344) or have no decimal point (e.g., 2E6).  However, both forms
    would be acceptable to a FORTRAN compiler.  Also, the debugger does not
    support double precision floating-point constants where "D" is used
    instead of "E" for the exponent part (e.g., 2D6, 2.4352344D6).  All
    floating-point constants are stored internally by the debugger in double
    precision format.