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TMT Pascal Language Description
Pascal Language Structure
Types

Real Types

Real data types contain integer values as well as a fractional portion. Also known as floating point numbers, each real type consists of a significant, the fractional part, and an exponent, which is a power of ten.

TMT Pascal follows the IEEE standard for floating point number representation. There are five real data types available under TMT Pascal: Real48, Real, Single, Double, and Extended.
TypeRangeFormat
Single1.5 x 10-45 .. 3.4 x 1038 6 to 7 significant digits,
32-bit
Real482.9 x 10-39 .. 1.7 x 1038 11 to 12 significant digits,
48-bit
Double5.0 x 10-324 .. 1.7 x 10308 15 to 16 significant digits,
64-bit
Real5.0 x 10-324 .. 1.7 x 10308 15 to 16 significant digits,
64-bit
Extended1.9 x 10-4951 .. 1.1 x 104932 19-20 significant digits,
80-bit
 The internal format of TMT Pascal's real type differs to Borland's one. Actually the generic type Real is equivalent to Double.

Real48 is maintained for backward compatibility with older versions of compiler. Since its storage format is not native to the Intel CPU's, it results in slower performance than other floating-point types.

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