Real128 Data Type

Holds signed 128-bit (16-byte) IEEE floating-point values in the range −1.189731495357231765085759326628007E+4932 to −3.362103143112093506262677817321753E−4932 for negative values and 3.362103143112093506262677817321753E−4932 to 1.189731495357231765085759326628007E+4932 for positive values.


The data type Real128 gives the largest and smallest possible magnitudes for a number. Real128 is two times the size of Real64 and four times the size of Real32.

Floating-point data types cannot store all values accurately. Some operations can cause results that you think are incorrect. A typical example is when you compare values. See Data Type Troubleshooting for more information.
Default value
When you declare a variable of type Real128 and do not initialize it, its default value is zero (0.0).
Zeros at the end
The floating-point data types usually cannot show 0 characters at the end, after the decimal point. Thus numbers, for example, 1.4200 and 1.42 are the same value. If you must show zeros at the end, you must use a formatter procedure.
Type characters
Real128 has no type characters.

Shared methods and properties

Real128.Default As Real128
Returns the default value, 0.0.
Real128.Epsilon As Real128
Returns the smallest difference between two values.
Real128.IsInf(num As Real128) As Boolean
Returns true if num is infinity (positive or negative). Mathematical overflow is one cause of this result.
Real128.IsNaN(num As Real128) 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.
Real128.IsNegInf(num As Real128) As Boolean
Returns true if num is negative infinity.
Real128.IsPosInf(num As Real128) As Boolean
Returns true if num is positive infinity.
Real128.Max As Real128
Returns the maximum positive value.
Real128.Min As Real128
Returns the minimum negative value.
Real128.Parse(str As String, Optional #format As Format) As Real128
Tries to parse a string that shows as a floating-point number.
If #format is not given or is #Null, it uses the format of the local culture. Or you can make it clear with Format.UserLocale.
If #format is Format.RealLiteral, it uses the format of a literal of type Real128.
Real128.Size As Int32
Returns the number of available bytes. This is always 16.


Dim foo As Real128

See also