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32 lines
1.4 KiB
Plaintext
32 lines
1.4 KiB
Plaintext
{{DISPLAYTITLE:_FLOAT}}
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'''_FLOAT''' numerical values offer the maximum floating-point decimal precision available using '''QB64'''.
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{{PageSyntax}}
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::[[DIM]] {{Parameter|variable}} AS [[_FLOAT]]
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{{PageDescription}}
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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]].
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* Under the current implementation it is stored in a 10-byte floating point variable.
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* [[_FLOAT]] variables can also use the ## variable name type suffix.
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* Values returned may be expressed using exponential or [[scientific notation]] using '''E''' for SINGLE or '''D''' for DOUBLE precision.
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* 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.
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* Floating decimal point numerical values cannot be [[_UNSIGNED]].
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* Values can be converted to 32 byte [[ASCII]] strings using [[_MK$]] and back with [[_CV]].
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* '''When a variable has not been assigned or has no type suffix, the value defaults to [[SINGLE]].'''
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* Note: OpenGL's [[_GL_FLOAT]] constant is a [[SINGLE]] (4 byte) floating point number, while a native QB64 _FLOAT is a 10-byte floating point number.
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{{PageSeeAlso}}
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* [[DOUBLE]], [[SINGLE]]
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* [[_MK$]], [[_CV]]
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* [[_DEFINE]], [[DIM]]
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* [[PDS (7.1) Procedures#CURRENCY|CURRENCY]]
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* [[Variable Types]]
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{{PageNavigation}}
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