Real Data Type

Holds signed floating-point values that must be at least 64 bits (8 bytes) and provides the best performance. On Intel platforms this could be an 80-bit (10-byte) value in the range −1.18973149535723176502E+4932 to −3.64519953188247460253E−4951 for negative values and 3.64519953188247460253E−4951 to 1.18973149535723176502E+4932 for positive values.

Instructions

Precision: Know that floating-point data types cannot represent many values accurately. Operations such as comparisons can cause results that you think are incorrect. See Troubleshooting Data Types for more information.
Performance: ViviFire makes sure that calculations with Real are the fastest for a type at least as large as Real64. Platforms for which the fastest floating-point type is smaller than Real64 must use Real64 to be compatible.
Default value: When you declare a variable of type Real and do not initialize it, its default value is zero (0.0).
Type changes: The Real data type widens to Real128 without risk of overflow.
Trailing zeros: The floating-point data types cannot internally represent trailing 0 characters after the decimal point. Thus numbers such as 1.4200 and 1.42 are the same value. If you must show trailing zeros, then you must use a formatter procedure.
Type characters: If you add an exclamation point (!) to the end of a variable name, then it has the type Real.

Real literal

[ integer_part ] . fractional_part [ E [ + | - ] exponent_part ] [ ! ]

integer_part E [ + | - ] exponent_part [ ! ]

integer_part !

Parts

integer_part: One or more decimal digits. You can use an underscore character (_) to divide it into groups of digits.
fractional_part: One or more decimal digits.
exponent_part: One or more decimal digits. Typically the maximum number of digits is three or four.

Shared methods and properties

Real.Default As Real: Returns the default value, 0.0.
Real.Epsilon As Real: Returns the smallest difference between two values.
Real.IsInf(num As Real) As Boolean: Returns true if num is infinity (positive or negative). Mathematical overflow is one cause of this result.
Real.IsNaN(num As Real) As Boolean: Returns true if num is not a number (Nan). “Zero divided by zero” and “square root of a negative” are two causes of this result.
Real.IsNegInf(num As Real) As Boolean: Returns true if num is negative infinity.
Real.IsPosInf(num As Real) As Boolean: Returns true if num is positive infinity.
Real.Max As Real: Returns the maximum positive value.
Real.Min As Real: Returns the minimum negative value.
Real.Parse(str As String, Optional #fmt As Format) As Real: Tries to parse a string that shows as a floating-point number.; If #fmt is not given or is #Null, then it uses the format of the local culture. Or you can be explicit with Format.UserLocale.; If #fmt is Format.RealLiteral, then it uses the format of a literal of type Real.
Real.Size As Int: Returns the number of available bytes. Typical values are 8 or 10.

Examples

Dim foo As Real
Dim bar!