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{{PageSyntax}} | {{PageSyntax}} | ||
::[[DIM]] {{Parameter|variable}} AS [[_FLOAT]] | ::[[DIM]] {{Parameter|variable}} AS [[_FLOAT]] | ||
{{PageDescription}} | {{PageDescription}} | ||
* '''QB64''' always allocates 32 bytes to store this value. | * '''QB64''' always allocates 32 bytes to store this value. | ||
* It is safe to assume this value is at least as precise as [[DOUBLE]]. | * It is safe to assume this value is at least as precise as [[DOUBLE]]. | ||
* Under the current implementation it is stored in a 10-byte floating point variable. | * Under the current implementation it is stored in a 10-byte floating point variable. | ||
* [[_FLOAT]] variables can also use the ## variable name type suffix. | * [[_FLOAT]] variables can also use the ## variable name type suffix. | ||
* Values returned may be expressed using exponential or [[scientific notation]] using '''E''' for SINGLE or '''D''' for DOUBLE precision. | * Values returned may be expressed using exponential or [[scientific notation]] using '''E''' for SINGLE or '''D''' for DOUBLE precision. | ||
* According to [http://babbage.cs.qc.edu/courses/cs341/IEEE-754references.html IEEE-754] this can store a value of up to 1.1897E+4932 compared to a DOUBLE which goes up to 1.7976E+308. | * According to [http://babbage.cs.qc.edu/courses/cs341/IEEE-754references.html IEEE-754] this can store a value of up to 1.1897E+4932 compared to a DOUBLE which goes up to 1.7976E+308. | ||
* Floating decimal point numerical values cannot be [[_UNSIGNED]]. | * Floating decimal point numerical values cannot be [[_UNSIGNED]]. | ||
* Values can be converted to 32 byte [[ASCII]] strings using [[_MK$]] and back with [[_CV]]. | * Values can be converted to 32 byte [[ASCII]] strings using [[_MK$]] and back with [[_CV]]. | ||
Revision as of 01:39, 23 January 2023
_FLOAT numerical values offer the maximum floating-point decimal precision available using QB64.
Syntax
Description
- QB64 always allocates 32 bytes to store this value.
- It is safe to assume this value is at least as precise as DOUBLE.
- Under the current implementation it is stored in a 10-byte floating point variable.
- _FLOAT variables can also use the ## variable name type suffix.
- Values returned may be expressed using exponential or scientific notation using E for SINGLE or D for DOUBLE precision.
- According to IEEE-754 this can store a value of up to 1.1897E+4932 compared to a DOUBLE which goes up to 1.7976E+308.
- Floating decimal point numerical values cannot be _UNSIGNED.
- Values can be converted to 32 byte ASCII strings using _MK$ and back with _CV.
- When a variable has not been assigned or has no type suffix, the value defaults to SINGLE.
See also