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  System.Single Structure
Calling writeTextBlock The Single structure holds floating point numbers in the range +/-3.402823e38, plus the following extreme values :
PositiveInfinity Infinity (N/0)
NegativeInfinity -Infinity (-N/0)
NaN Not a number (0/0)

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

Epsilon  Single  Smallest non-zero +ve value : 4.94065645841247e-324
MinValue  Single  Largest negative value : -3.402823e38
MaxValue  Single  Largest negative value : 3.402823e38
NaN  Single  Not a number : 0/0
NegativeInfinity  Single  -Infinity
PositiveInfinity  Single  Infinity

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