How to define a 2D array of type String in delphi

procedure : tobject);

vararr:array of array of string;

beginsetlength(arr,2,3);

arr[1,2]:='this is a test';

setlength(arr,0,0);

setlength(arr,4,5);

showmessage(arr[1,2]);

end;The way to declare a two-dimensional array is to use the array of array of types, which is very close to the way people think. In the same way, you can declaring a three-dimensional array as array of array of array of types.

The setlength function is still used to adjust the size of the two-dimensional array, the first parameter is the name of the array, the second parameter is the size of the dimension closest to the name of the array, the third parameter is the size of the dimension away from the name of the array, and so on.

Doubly linked lists.

Two-dimensional arrays. data: array[0..2,0..2] of integer;Static.

data: array of array of integer;Dynamic.

This should be done with struct arrays.

type tuseinfo=reocrd

usname: string[20];

uspsw: string[20];

end;var

userlist: array[1..10] of tuserinfo;

In delphi (object pascal language), the array keyword is used for array definition.

If you need to define a two-dimensional array, you can take the following definition:

1. Definition of static arrays.

A static array definition, usually used when the number of array elements is determined. It is defined in the following form:

Example: type

Define the 2D array type.

tmultiarr = array[1..3,1..3] of string;

varmultiarr: tmultiarr;

Define an integer array of row 12 x column 12.

intarr: array[1..12] of array[1..12] of integer;

Define a string array of rows5*columns5.

strarr: array[1..5,1..5] of string;

2. Definition of dynamic arrays.

Dynamic arrays are often used when the number of elements in the array is uncertain, and is defined in the following form:

samarr: array of array of integer;Define a two-dimensional array, the elements of the array are indeterminate.

type tmessagegrid = array of array of string;Define a two-dimensional array type, the array elements are indeterminate.

var msgs: tmessagegrid;Declare a two-dimensional array-type variable.

The number of elements in a two-dimensional dynamic array can be dynamically specified by setlenth, as shown below

procedure : tobject);

type tmultiarr = array of array of string;

vara: tmultiarr;

i, j: integer;

s: string;

beginsetlength(a, 10);

for i := low(a) to high(a) do

beginsetlength(a[i], i);

for j := low(a[i]) to high(a[i]) do

a[i, j] := inttostr(i) +',' + inttostr(j) +' ';

end;for i := low(a) to high(a) do

begins := '';

for j := low(a[i]) to high(a[i]) do

s := s + ' ' + a[i, j];

end;end;

**Running Screenshot:

Choose one of two forms, for example:

amatrix : array[1..10] of array[1..50] of real;

bmatrix : array[1..10, 1..50] of real;