DEC Text Processing Utility Data Types

3.10 Range Data Type

The following example assigns a value of the range data type to the variable x:

x := CREATE_RANGE (mark1, mark2, UNDERLINE);

You can specify the video attribute with which DECTPU should display a range. The possible attributes are BLINK, BOLD, REVERSE, and UNDERLINE. The UNDERLINE keyword in the preceding example specifies that the characters in the range will be underlined when they appear on the screen. You cannot give more than one video attribute to a range. However, to apply multiple video attributes to a given set of characters, you can define more than one range that contains those characters and give one video attribute to each range.

3.11 String Data Type

DECTPU uses the string data type to represent character data. A value of the string data type can contain any of the elements of a character set. You can select one of the following character sets to use with your string data:

•DEC_MCS—DEC Multinational Character Set

•ISO_LATIN1—ISO Latin1 Character Set

•GENERAL—Other general character sets

DECTPU uses the string data type to represent character data. A value of the string data type can contain any of the elements of the character sets mentioned previously. To specify a string constant, enclose the value in quotation marks. In DECTPU, you can use either the quotation mark ( " ) or the apostrophe ( ’ ) as the delimiter for a string. The following statements assign a value of the string data type to the variable x:

x := ’abcd’; x := "abcd";

To specify the quote character itself within a string, type the character twice if you are using the same quote character as the delimiter for the string. The following statements show how to quote an apostrophe and a quotation mark, respectively:

x

:=

’’’’;

!

The

value

assigned

to

x

is

’.

x

:=

"""";

!

The

value

assigned

to

x

is

".

If you use the alternate quote character as the delimiter for the string within which you want to specify a quote character, you do not have to type the character twice. The following statements show how to quote an apostrophe and a quotation mark, respectively, when you use the alternate quote character to delimit the string:

x

:=

"’";

!

The

value

assigned

to

x

is

’.

x

:=

’"’;

!

The

value

assigned

to

x

is

".

A null string is a string of length zero. You can assign a null string to the variable x in the following way:

x := ’’;

To create a string from the contents of a range, use the STR or the SUBSTR built-in procedure. To create a string from the contents of a buffer, use the STR built-in.

3–20DEC Text Processing Utility Data Types

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Compaq AA-PWCBD-TE manual String Data Type
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