Difference between revisions of "Subranges"

From Lazarus wiki
m (Text replace - "delphi>" to "syntaxhighlight>")
Line 2: Line 2:
  
 
A ''subrange'' type is defined in terms of another ordinal data type. The type specification is:
 
A ''subrange'' type is defined in terms of another ordinal data type. The type specification is:
<delphi>
+
<syntaxhighlight>
 
lowest_value .. highest_value
 
lowest_value .. highest_value
</delphi>
+
</syntaxhighlight>
  
 
where <tt>lowest_value < highest_value</tt> and the two values are both in the range of another ordinal data type.
 
where <tt>lowest_value < highest_value</tt> and the two values are both in the range of another ordinal data type.
  
 
For example, you may want to declare the days of the week as well as the work week:
 
For example, you may want to declare the days of the week as well as the work week:
<delphi>
+
<syntaxhighlight>
 
type
 
type
 
   DaysOfWeek = (Sunday, Monday, Tuesday, Wednesday,
 
   DaysOfWeek = (Sunday, Monday, Tuesday, Wednesday,
 
                 Thursday, Friday, Saturday);
 
                 Thursday, Friday, Saturday);
 
   DaysOfWorkWeek = Monday..Friday;
 
   DaysOfWorkWeek = Monday..Friday;
</delphi>
+
</syntaxhighlight>
  
 
You can also use subranges for built-in ordinal types such as <tt>char</tt> and <tt>integer</tt>.  
 
You can also use subranges for built-in ordinal types such as <tt>char</tt> and <tt>integer</tt>.  

Revision as of 15:59, 24 March 2012

5B - Subranges (author: Tao Yue, state: unchanged)

A subrange type is defined in terms of another ordinal data type. The type specification is:

lowest_value .. highest_value

where lowest_value < highest_value and the two values are both in the range of another ordinal data type.

For example, you may want to declare the days of the week as well as the work week:

type
  DaysOfWeek = (Sunday, Monday, Tuesday, Wednesday,
                Thursday, Friday, Saturday);
  DaysOfWorkWeek = Monday..Friday;

You can also use subranges for built-in ordinal types such as char and integer.

previous contents next