CVS - QB64 Wiki

CVS

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The CVS function converts 2 byte GET or MKS$ STRING values to SINGLE floating decimal numerical values.


Syntax: CVS(2-byte string)


  • Numeric values read in from a RANDOM-access or BINARY disk file must be converted from ASCII string characters back into numbers if they are to be arithmetically manipulated.
  • SINGLE values can range up to 7 decimal point digits. Decimal point accuracy depends on whole value places taken.
  • CVS converts a 4-byte string created by MKS$ to a SINGLE-precision numerical value.
  • CVD converts an 8-byte string created by MKD$ to a DOUBLE-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:

FIELD #1, 4 AS N$, 12 AS B$... GET #1 Y = CVS(N$)

Explanation: Reads a field from file #1, and converts the first four bytes (N$) into a single-precision number assigned to the variable Y.
Since a single-precision number can contain as many as seven ASCII characters (seven bytes), writing a file using MKS$ conversion, and reading with the CVS conversion, as many as three bytes per number recorded are saved on the storage medium. Even more may be saved if double-precision numbers are required. MKD$ and CVD conversions would be used in this case.


See also:



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