Progress
Language Reference
ASC Function
Converts a character expression representing a single character into the corresponding ASCII (or internal code page) integer value.
SYNTAX
expression
An expression with a value of a single character that you want to convert to an ASCII (or internal code page) integer value. If expression is a constant, you must enclose it in quotation marks (" "). If the value of expression is other than a single character, ASC returns the value -1.
The values for expression are case sensitive. For example, ASC("a") returns a different value than ASC("A").
target-codepage
A character-string expression that evaluates to the name of a code page. The name that you specify must be a valid code page name available in the
DLC/convmap.cp
file (a binary file that contains all of the tables that Progress uses for character management). If you supply a non-valid name, the ASC function returns the value -1 and returns a runtime error. Before returning an integer value, the ASC function converts expression from source-codepage to target-codepage. The returned integer value is relative to target-codepage. If you do not specify target-codepage, the value returned is the code page identified with the Internal Code Page (-cpinternal) parameter.source-codepage
A character-string expression that evaluates to the name of a code page. The name that you specify must be a valid code page name available in the
EXAMPLEDLC/convmap.cp
file. If you supply a non-valid name, the ASC function returns the value -1. The source-codepage specifies the name of the code page to which expression is relative. The default value of source-codepage is the code page identified with the Internal Code Page (-cpinternal) parameter.The following procedure counts how many customers names begin with each of the letters, A-Z. It counts all other customers separately. The procedure uses the ASC function to translate a letter into an integer that it uses as an array subscript for counting.
NOTES
- The ASC function returns the corresponding value in the specified character set. By default, the value of SESSION:CHARSET is iso8859-1. You can set a different internal code page by specifying the Internal Code Page (-cpinternal) parameter. For more information, see the Progress Internationalization Guide .
- The ASC function is double-byte enabled. If the expression argument yields a double-byte character, this function returns a value greater than 255 and less than 65535.
SEE ALSO
CHR Function, CODEPAGE-CONVERT Function, INTEGER Function, SESSION System Handle
Copyright © 2004 Progress Software Corporation www.progress.com Voice: (781) 280-4000 Fax: (781) 280-4095 |