mirror of
https://github.com/QB64-Phoenix-Edition/QB64pe.git
synced 2024-07-26 07:25:53 +00:00
6e01fc8dce
Added new _STRCMP and _STRICMP commands for quick string comparisons. Cleaned up QB64 to finish removing the QUI (quick user insert) code and folders. Altered UCASE and LCASE routines to be faster in some situations for us.
35 lines
1.6 KiB
Plaintext
35 lines
1.6 KiB
Plaintext
The '''CVD''' function converts 8 byte [[GET]] or [[MKD$]] [[STRING]] values to [[DOUBLE]] numeric values.
|
|
|
|
|
|
::::::''Syntax:'' CVD(''8-byte string'')
|
|
|
|
|
|
* The 8 byte string value was created by [[MKD$]] or [[PUT]].
|
|
* Numeric values read from a [[RANDOM]]-access or [[BINARY]] file must be converted from [[ASCII]] string characters back into numbers if they are to be arithmetically manipulated.
|
|
* [[DOUBLE]] values can range up to 15 decimal point digits. Decimal point accuracy depends on whole value places taken.
|
|
* [[CVD]] converts an 8-byte string created by [[MKD$]] to a [[DOUBLE]]-precision numerical value.
|
|
* [[CVS]] converts a 4-byte string created by [[MKS$]] to a [[SINGLE]]-precision numerical value.
|
|
* [[CVI]] converts a 2-byte string created by [[MKI$]] to an [[INTEGER]] numerical value.
|
|
* [[CVL]] converts a 4 byte string created by [[MKL$]] to a [[LONG]] integer numerical value.
|
|
* CV functions can only be used to convert values from [[MK$]] string function values or data from [[BINARY]] files!
|
|
|
|
|
|
''Examples:''
|
|
{{CodeStart}} '' ''
|
|
{{Cl|FIELD}} #1, 8 {{Cl|AS}} N$, 12 {{Cl|AS}} B$...
|
|
{{Cl|GET}} #1
|
|
Y# = {{Cl|CVD}}(N$) '' ''
|
|
{{CodeEnd}}
|
|
: ''Explanation:'' Reads a field from file #1, and converts the first eight bytes (N$) into an double-precision number assigned to the variable Y#.
|
|
|
|
:Since a double-precision number can contain as many as 15 ASCII characters (fifteen bytes), writing a file using [[MKD$]] conversion, and reading with the [[CVD]] conversion, as many as 7 bytes per number recorded are saved on the storage medium.
|
|
|
|
|
|
''See also:''
|
|
|
|
* [[MKD$]], [[MKI$]], [[MKS$]], [[MKL$]]
|
|
* [[CVI]], [[CVS]], [[CVL]]
|
|
* [[_CV]], [[_MK$]]
|
|
|
|
|
|
{{PageNavigation}} |