5.6 PLVchr: Operations and Single Characters

Chapter 5
PL/Vision Package Specifications

 

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5.6 PLVchr: Operations on Single Characters

The PLVchr (PL/Vision CHaRacter) package provides information about single characters in a string. See the companion disk for details.

5.6.1 PLVchr constants

blank_char CONSTANT CHAR(1) := ' ';

space_char CONSTANT CHAR(1) := ' ';

quote1_char CONSTANT CHAR(1) := '''';

quote2_char CONSTANT CHAR(2) := '''''';

tab_char CONSTANT CHAR(1) := CHR(9);

newline_char CONSTANT CHAR(1) := CHR(10);

Named constants to use in place of hard-coded literals. Sure, there is more typing involved. But at least you don't have to mess with single quotes, and the code is a lot more readable.

c_nonprinting CONSTANT CHAR(1) := 'n';

c_digit CONSTANT CHAR(1) := '9';

c_letter CONSTANT CHAR(1) := 'a';

c_other CONSTANT CHAR(1) := '*';

c_all CONSTANT CHAR(1) := '%';

Action codes for use in PLVchr programs that allow you to specify the category of character that you want to work with.