Difference between revisions of "CVI"
(Created page with ''''Purpose:''' To convert string values to numeric values. '''Syntax:''' CVI(2-byte string) CVS(4-byte string) CVD(8-byte string) '''Comments:''' Numeric values read in from a …')
|Line 3:||Line 3:|
Revision as of 16:59, 31 August 2009
Purpose: To convert string values to numeric values.
Syntax: CVI(2-byte string)
Comments: Numeric values read in from a random-access disk file must be converted from strings back into numbers if they are to be arithmetically manipulated.
CVI converts a 2-byte string to an integer. MKI$ is its complement.
CVS converts a 4-byte string to a single-precision number. MKS$ is its complement.
CVD converts an 8-byte string to a double-precision number. MKD$ is its complement.
(See MKI$, MKS$, and MKD$).
FIELD #1, 4 AS N$, 12 AS B$... GET #1 Y=CVS(N$)
Line 80 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 numbe r 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.