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real_eight_byte_signed_floating_point_.htm
Navigation:  Language Reference > 3 - Variable Declarations > Data Types >====== REAL (eight-byte signed floating point) ====== Previous pageReturn to chapter overviewNext page
label REAL([initial value]) [,DIM( )] [,OVER( )] [,NAME( )] [,EXTERNAL] [,DLL] [,STATIC] [,THREAD]
[,AUTO] [,PRIVATE] [,PROTECTED]

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REAL An eight-byte floating point number.

Format:  ±    exponent         significand

      | . | ……….. | ………………… |

Bits:63  62             52                      0

Range: 0, ± 2.225073858507201e-308 .. ± 1.79769313496231e+308

(15 significant digits)

initial value A numeric constant. If omitted, the initial value is zero, unless the AUTO attribute is present.
DIM Dimension the variable as an array.
OVER Share a memory location with another variable.
NAME Specify an alternate, “external” name for the field.
EXTERNAL Specify the variable is defined, and its memory is allocated, in an external library. Not valid within FILE, QUEUE, or GROUP declarations.
DLL Specify the variable is defined in a .DLL. This is required in addition to the EXTERNAL attribute.
STATIC Specify the variable's memory is permanently allocated.
THREAD Specify memory for the variable is allocated once for each execution thread. Also implicitly adds the STATIC attribute on Procedure Local data.
AUTO Specify the variable has no initial value.
PRIVATE Specify the variable is not visible outside the module containing the CLASS methods. Valid only in a CLASS.
PROTECTED Specify the variable is not visible outside base CLASS and derived CLASS methods. Valid only in a CLASS.

REAL declares an eight-byte floating point signed numeric variable, using the Intel 8087 long real (double precision) format.

Example:

Count1 REAL                         !Declare eight-byte signed floating point

Count2 REAL,OVER(Count1)            !Declare OVER the eight-byte

                                   !signed floating point

Count3 REAL,DIM(4)                  !Declare it an array of 4 reals

Count4 REAL(5)                      !Declare with initial value

Count5 REAL,EXTERNAL                !Declare as external

Count6 REAL,EXTERNAL,DLL            !Declare as external in a .DLL

Count7 REAL,NAME('SixCount')        !Declare with external name

ExampleFile FILE,DRIVER('Clarion')  !Declare a file

Record       RECORD

Count8        REAL,NAME('Counter')  !Declare with external name

            END

           END

real_eight_byte_signed_floating_point_.htm.txt · Last modified: 2021/04/15 15:57 (external edit)