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28 lines
1.1 KiB
Plaintext
28 lines
1.1 KiB
Plaintext
'''DOUBLE''' type floating point numerical values use 8 bytes per value.
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{{PageSyntax}}
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:: [[DIM]] ''variable'' AS DOUBLE
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{{PageDescription}}
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* Literal or variable values can range up to 15 decimal point places.
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* Qbasic variable suffix type is #. The IDE may add the suffix after literal values.
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* Results of mathematical calculations may be approximate or slow in Quickbasic 4.5.
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* Use DOUBLE and [[_FLOAT]] variables SPARINGLY! They use a lot of program memory.
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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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* Floating decimal point numerical values cannot be [[_UNSIGNED]]!
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* Values can be converted to 8 byte [[ASCII]] string values using [[_MKD$]] and back with [[_CVD]].
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* '''When a variable has not been defined or has no type suffix, the value defaults to [[SINGLE]].'''
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* '''Warning: Qbasic keyword names cannot be used as numerical variable names with or without the type suffix!'''
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{{PageSeeAlso}}
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* [[DIM]], [[DEFDBL]]
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* [[MKD$]], [[CVD]]
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* [[SINGLE]], [[_FLOAT]]
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* [[LEN]]
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* [[Variable Types]]
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{{PageNavigation}} |