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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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─────Double-Precision REAL──────────────────────────────────────────────────
 
     A double-precision real value occupies 8 bytes of memory. Its
     precision is between 15 and 16 decimal digits. The range of
     double-precision real values includes the negative numbers from
     approximately -1.797693134862316D+308 to -2.225073858507201D-308,
     the number 0, and the positive numbers from approximately
     +2.225073858507201D-308 to +1.797693134862316D+308.
 
     A double-precision real constant has the same form as a
     single-precision real constant, except that the letter D is used
     for exponents instead of the letter E, and an exponent part is
     mandatory. If an exponent does not include the letter D, the number
     is interpreted as a single-precision constant.
                                    -♦-