Difference between revisions of "Array"
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− | An '''array''' is a type that groups a number of [[Variable|variables]] of the same type | + | An '''array''' is a type that groups a number of [[Variable|variables]] of the same type. Example are an array of [[Char|char]], [[Integer|integer]], [[real]] or any other type including user defined types. |
− | |||
− | The simplest way is as follows: | + | Different types of variables cannot be grouped into an array. For this purpose, see [[Record|record]]s. |
+ | |||
+ | |||
+ | The declaration works similar to that for simple types, but you need to add the number of elements & basic type. | ||
+ | |||
+ | The simplest way is as follows - it defines a so-called static array: | ||
<syntaxhighlight> | <syntaxhighlight> | ||
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</syntaxhighlight> | </syntaxhighlight> | ||
− | + | Simple example: | |
<syntaxhighlight> | <syntaxhighlight> | ||
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var | var | ||
− | + | Numbers: simple_integer_array; | |
</syntaxhighlight> | </syntaxhighlight> | ||
− | complex example: | + | More complex example: |
<syntaxhighlight> | <syntaxhighlight> | ||
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</syntaxhighlight> | </syntaxhighlight> | ||
− | Arrays reflect the | + | Arrays reflect the mathematical concept of |
− | [[Multidimensional arrays|multidimensional array]] | + | * [[vector]]s (one-dimensional array) and |
− | To call a variable you have to put the name of the array and the position < | + | * matrices (two-dimensional array) |
+ | [[Multidimensional arrays|multidimensional array]] are supported such as [x..y,z..t] and so on. | ||
+ | |||
+ | To call a variable you have to put the name of the array and the position <code>a[1..3]</code> and you can use it as a simple variable, but if you want to use parameters you MUST use a structure because else it will cause errors or bugs... (I do not understand, what is meant here). | ||
If it is not possible to know the number of elements at the time of the program compilation, the [[DYNAMIC_ARRAY|dynamic array]] type can be used. | If it is not possible to know the number of elements at the time of the program compilation, the [[DYNAMIC_ARRAY|dynamic array]] type can be used. | ||
{{Data types}} | {{Data types}} | ||
+ | [[Category:FPC]] |
Revision as of 16:23, 28 December 2013
An array is a type that groups a number of variables of the same type. Example are an array of char, integer, real or any other type including user defined types.
Different types of variables cannot be grouped into an array. For this purpose, see records.
The declaration works similar to that for simple types, but you need to add the number of elements & basic type.
The simplest way is as follows - it defines a so-called static array:
program
...
var
variablename: array [startindex..endindex] of type;
begin
...
Simple example:
type
simple_integer_array = array [1..10] of integer;
var
Numbers: simple_integer_array;
More complex example:
type
more_complex_array = array [0..5,1..3] of extended;
var
specialmatrix: more_complex_array;
Arrays reflect the mathematical concept of
- vectors (one-dimensional array) and
- matrices (two-dimensional array)
multidimensional array are supported such as [x..y,z..t] and so on.
To call a variable you have to put the name of the array and the position a[1..3]
and you can use it as a simple variable, but if you want to use parameters you MUST use a structure because else it will cause errors or bugs... (I do not understand, what is meant here).
If it is not possible to know the number of elements at the time of the program compilation, the dynamic array type can be used.
simple data types |
|
---|---|
complex data types |