subrangeType
| Syntax | A subrangeType is:
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| Description | A subrange type defines a set of values, for example, the subrange 1 .. 4 consists of 1, 2, 3 and 4.
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| Example |
var i : 1 .. 10 % i can be 1, 2 … up to 10
type xRange : 0 .. 319 % Define integer subrange
var pixels : array xRange of int
% Array elements are
% numbered 0, 1, … 319
for k : xRange % k ranges from 0 to 319
pixels ( k ) := 0
end for
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| Details | A subrange must contain at least one element. In other words, the second expression (expn) must be at least as large as the first expression. The lower bound of a subrange must be known at compile time. The upper bound is allowed to be a run time value only in one situation and that is when it gives the upper bound of an array being declared in a variable declaration, in other words when declaring a dynamic array. Subranges are usually a subset of the integers, as in 1 .. 10. You can also have subranges of enumerated types and characters (the char type). You can apply lower and upper to subrange types.
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