Delphi Language Guide Delphi for Microsoft Win32 Delphi for the Microsoft. Net framework

Fundamental Win32 real types
Type
Range
Significant digits Size in bytes
Real48
-2.9 x 10^39 .. 1.7 x 10^38
1112
6
Single
-1.5 x 10^45 .. 3.4 x 10^38
78
4
Double
-5.0 x 10^324 .. 1.7 x 10^308
1516
8
68

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Extended -3.6 x 10^4951 .. 1.1 x 10^4932
1920
10
Comp
-2^63+1 .. 2^63 1
1920
8
Currency -922337203685477.5808.. 922337203685477.5807 1920
8
The following table shows how the fundamental real types map to .NET framework types.
Fundamental .NET real type mappings
Type
.NET Mapping
Real48
Deprecated
Single
Single
Double
Double
Extended Double
Comp
Deprecated
Currency Re-implemented as a value type using the Decimal type from the .NET Framework
The generic type Real, in its current implementation, is equivalent to Double (which maps to Double on .NET).