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  System.Double Structure
Calling writeTextBlock The Double structure holds floating point numbers in the range +/-1.79769313486232e308, plus the following extreme values :
PositiveInfinity Infinity (N/0)
NegativeInfinity -Infinity (-N/0)
NaN Not a number (0/0)

Double complies with IEEE standards for calculations.
Unlike the Decimal structure, rounding can occur with Double value calculations.
Double structures are created dynamically from their definition - there is no Create constructor. The native delphi Double type maps to System.Double. After writeTextBlock
CompareTo  Compares the current Double value to another
Equals  Determines if the current Double equals another
IsInfinity  Returns true if a a given Double is +/- infinite in value
IsNaN  Returns true if a a given Double has no valid value
IsNegativeInfinity  Returns true if a a given Double is - infinite in value
IsPositiveInfinity  Returns true if a a given Double is + infinite in value
Parse  Converts a string representation of a Double into a Double value
ToString  Converts the current Double value to a string

Epsilon  Double  Smallest non-zero +ve value : 4.94065645841247e-324
MinValue  Double  Largest negative value : 1.79769313486232e308
MaxValue  Double  Largest negative value : 1.79769313486232e308
NaN  Double  Not a number : 0/0
NegativeInfinity  Double  -Infinity
PositiveInfinity  Double  Infinity

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