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44 lines
1.6 KiB
Markdown
44 lines
1.6 KiB
Markdown
The [CVDMBF](CVDMBF) function decodes an 8-byte [STRING](STRING) generated by [MKDMBF$](MKDMBF$) (or read from a file) to [DOUBLE](DOUBLE) numeric values.
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## Syntax
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> result# = [CVDMBF](CVDMBF)(stringData$)
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## Description
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* *CV* functions ([CVD](CVD), [CVS](CVS), [CVI](CVI), [CVL](CVL), [CVDMBF](CVDMBF), [CVSMBF](CVSMBF)) are used to convert values encoded by *MK$* functions ([MKD$](MKD$), [MKS$](MKS$), [MKI$](MKI$), [MKL$](MKL$), [MKDMBF$](MKDMBF$), [MKSMBF$](MKSMBF$)).
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* **QB64** has [_CV](_CV) and [_MK$](_MK$) functions which can also deal with extended [Data types](Data-types).
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* [DOUBLE](DOUBLE) values can range up to 15 decimal point digits. Decimal point accuracy depends on whole value places taken.
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## Example(s)
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Showcases the reduced space to store an encoded number.
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```vb
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a# = 77000.24523213
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PRINT "Value of a#:"; a#
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b$ = MKDMBF$(a#)
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PRINT "Value of a# encoded using MKDMBF$: "; b$
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PRINT "The string above, decoded using CVDMBF:"; CVDMBF(b$)
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```
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```text
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Value of a#: 77000.24523213
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Value of a# encoded using MKDmbf$: 5─c▼d▬æ
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The string above, decoded using CVDMBF: 77000.24523213
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```
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> Since the representation of a double-precision number can use up to 15 ASCII characters (fifteen bytes), writing to a file using [MKDMBF$](MKDMBF$) conversion, and then reading back with the [CVDMBF](CVDMBF) conversion can save up to 7 bytes of storage space.
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## See Also
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* [MKD$](MKD$), [MKI$](MKI$), [MKS$](MKS$), [MKL$](MKL$), [MKDMBF$](MKDMBF$), [MKSMBF$](MKSMBF$)
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* [CVI](CVI), [CVS](CVS), [CVD](CVD), [CVL](CVL), [CVSMBF](CVSMBF)
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* [_CV](_CV), [_MK$](_MK$)
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