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27 lines
1.4 KiB
Markdown
27 lines
1.4 KiB
Markdown
**_FLOAT** numerical values offer the maximum floating-point decimal precision available using **QB64**.
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## Syntax
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> [DIM](DIM) variable AS [_FLOAT](_FLOAT)
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## Description
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* **QB64** always allocates 32 bytes to store this value.
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* It is safe to assume this value is at least as precise as [DOUBLE](DOUBLE).
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* Under the current implementation it is stored in a 10-byte floating point variable.
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* [_FLOAT](_FLOAT) variables can also use the ## variable name type suffix.
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* Values returned may be expressed using exponential or [scientific notation](scientific-notation) using **E** for SINGLE or **D** for DOUBLE precision.
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* According to [IEEE-754](http://babbage.cs.qc.edu/courses/cs341/IEEE-754references.html) this can store a value of up to 1.1897E+4932 compared to a DOUBLE which goes up to 1.7976E+308.
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* Floating decimal point numerical values cannot be [_UNSIGNED](_UNSIGNED).
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* Values can be converted to 32 byte [ASCII](ASCII) strings using [_MK$](_MK$) and back with [_CV](_CV).
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* **When a variable has not been assigned or has no type suffix, the value defaults to [SINGLE](SINGLE).**
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* Note: OpenGL's [_GL_FLOAT](_GL-FLOAT) constant is a [SINGLE](SINGLE) (4 byte) floating point number, while a native QB64 _FLOAT is a 10-byte floating point number.
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## See Also
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* [DOUBLE](DOUBLE), [SINGLE](SINGLE)
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* [_MK$](_MK$), [_CV](_CV)
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* [_DEFINE](_DEFINE), [DIM](DIM)
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* [PDS (7.1) Procedures](PDS-(7.1)-Procedures)
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* [Variable Types](Variable-Types)
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