1<?xml version="1.0" encoding="UTF-8"?> 2 3<!--*********************************************************** 4 * 5 * Licensed to the Apache Software Foundation (ASF) under one 6 * or more contributor license agreements. See the NOTICE file 7 * distributed with this work for additional information 8 * regarding copyright ownership. The ASF licenses this file 9 * to you under the Apache License, Version 2.0 (the 10 * "License"); you may not use this file except in compliance 11 * with the License. You may obtain a copy of the License at 12 * 13 * http://www.apache.org/licenses/LICENSE-2.0 14 * 15 * Unless required by applicable law or agreed to in writing, 16 * software distributed under the License is distributed on an 17 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 18 * KIND, either express or implied. See the License for the 19 * specific language governing permissions and limitations 20 * under the License. 21 * 22 ***********************************************************--> 23 24<helpdocument version="1.0"> 25<meta> 26<topic id="textsbasicshared03102101xml" indexer="include" status="PUBLISH"> 27<title id="tit" xml-lang="en-US">ReDim Statement [Runtime]</title> 28<filename>/text/sbasic/shared/03102101.xhp</filename> 29</topic> 30</meta> 31<body> 32<section id="redim"> 33<bookmark xml-lang="en-US" branch="index" id="bm_id3150398"><bookmark_value>ReDim statement</bookmark_value> 34</bookmark> 35<paragraph role="heading" id="hd_id3150398" xml-lang="en-US" level="1" l10n="U" oldref="1"><link href="text/sbasic/shared/03102101.xhp" name="ReDim Statement [Runtime]">ReDim Statement [Runtime]</link></paragraph> 36<paragraph role="paragraph" id="par_id3154685" xml-lang="en-US" l10n="U" oldref="2">Declares a variable or an array.</paragraph> 37</section> 38<paragraph role="heading" id="hd_id3154218" xml-lang="en-US" level="2" l10n="U" oldref="3">Syntax:</paragraph> 39<paragraph role="paragraph" id="par_id3156214" xml-lang="en-US" l10n="U" oldref="4">[ReDim]Dim VarName [(start To end)] [As VarType][, VarName2 [(start To end)] [As VarType][,...]]</paragraph> 40<paragraph role="paragraph" id="par_id711996" xml-lang="en-US" l10n="NEW">Optionally, you can add the <emph>Preserve</emph> keyword as a parameter to preserve the contents of the array that is redimensioned.</paragraph> 41<paragraph role="heading" id="hd_id3148451" xml-lang="en-US" level="2" l10n="U" oldref="5">Parameters:</paragraph> 42<paragraph role="paragraph" id="par_id3156423" xml-lang="en-US" l10n="U" oldref="6"> 43<emph>VarName:</emph> Any variable or array name.</paragraph> 44<paragraph role="paragraph" id="par_id3149562" xml-lang="en-US" l10n="CHG" oldref="7"> 45<emph>Start, End:</emph> Numerical values or constants that define the number of elements (NumberElements=(end-start)+1) and the index range.<comment>UFI: deleted the numbers</comment></paragraph> 46<paragraph role="paragraph" id="par_id3155307" xml-lang="en-US" l10n="U" oldref="8">Start and End can be numeric expressions if ReDim is used at the procedure level.</paragraph> 47<paragraph role="paragraph" id="par_id3153951" xml-lang="en-US" l10n="U" oldref="9"> 48<emph>VarType:</emph> Keyword that declares the data type of a variable.</paragraph> 49<paragraph role="paragraph" id="par_id3147317" xml-lang="en-US" l10n="U" oldref="10"> 50<emph>Keyword:</emph> Variable type</paragraph> 51<paragraph role="paragraph" id="par_id3153728" xml-lang="en-US" l10n="U" oldref="11"> 52<emph>Bool: </emph>Boolean variable (True, False)</paragraph> 53<paragraph role="paragraph" id="par_id3146121" xml-lang="en-US" l10n="U" oldref="12"> 54<emph>Date:</emph> Date variable</paragraph> 55<paragraph role="paragraph" id="par_id3159156" xml-lang="en-US" l10n="U" oldref="13"> 56<emph>Double:</emph> Double floating point variable (1.79769313486232x10E308 - 4.94065645841247x10E-324)</paragraph> 57<paragraph role="paragraph" id="par_id3148616" xml-lang="en-US" l10n="U" oldref="14"> 58<emph>Integer:</emph> Integer variable (-32768 - 32767)</paragraph> 59<paragraph role="paragraph" id="par_id3147348" xml-lang="en-US" l10n="U" oldref="15"> 60<emph>Long:</emph> Long integer variable (-2,147,483,648 - 2,147,483,647)</paragraph> 61<paragraph role="paragraph" id="par_id3149412" xml-lang="en-US" l10n="U" oldref="16"> 62<emph>Object:</emph> Object variable (can only be subsequently defined by Set!)</paragraph> 63<paragraph role="paragraph" id="par_id3154729" xml-lang="en-US" l10n="U" oldref="17"> 64<emph>[Single]:</emph> Single floating-point variable (3.402823x10E38 - 1.401298x10E-45). If no key word is specified, a variable is defined as Single, unless a statement from DefBool to DefVar is used.</paragraph> 65<paragraph role="paragraph" id="par_id3148458" xml-lang="en-US" l10n="U" oldref="18"> 66<emph>String:</emph> String variable containing a maximum of 64,000 ASCII characters.</paragraph> 67<paragraph role="paragraph" id="par_id3149581" xml-lang="en-US" l10n="U" oldref="19"> 68<emph>Variant: </emph>Variant variable type (can contain all types and is set by definition).</paragraph> 69<paragraph role="paragraph" id="par_id3155601" xml-lang="en-US" l10n="U" oldref="20">In $[officename] Basic, you do not need to declare variables explicitly. However, you need to declare an array before you can use them. You can declare a variable with the Dim statement, using commas to separate multiple declarations. To declare a variable type, enter a type-declaration character following the name or use a corresponding key word.</paragraph> 70<paragraph role="paragraph" id="par_id3153415" xml-lang="en-US" l10n="U" oldref="21">$[officename] Basic supports single or multi-dimensional arrays that are defined by a specified variable type. Arrays are suitable if the program contains lists or tables that you want to edit. The advantage of arrays is that it is possible to address individual elements according to indexes, which can be formulated as numeric expressions or variables.</paragraph> 71<paragraph role="paragraph" id="par_id3146971" xml-lang="en-US" l10n="U" oldref="22">There are two ways to set the range of indices for arrays declared with the Dim statement:</paragraph> 72<paragraph role="paragraph" id="par_id3153950" xml-lang="en-US" l10n="U" oldref="23">DIM text(20) As String REM 21 elements numbered from 0 to 20</paragraph> 73<paragraph role="paragraph" id="par_id3146912" xml-lang="en-US" l10n="U" oldref="24">DIM text(5 to 25) As String REM 21 elements numbered from 5 to 25</paragraph> 74<paragraph role="paragraph" id="par_id3153709" xml-lang="en-US" l10n="U" oldref="25">DIM text$(-15 to 5) As String REM 21 elements (0 inclusive),</paragraph> 75<paragraph role="paragraph" id="par_id3150321" xml-lang="en-US" l10n="U" oldref="26">rem numbered from -15 to 5</paragraph> 76<paragraph role="paragraph" id="par_id3149018" xml-lang="en-US" l10n="U" oldref="27">Variable fields, regardless of type, can be made dynamic if they are dimensioned by ReDim at the procedure level in subroutines or functions. Normally, you can only set the range of an array once and you cannot modify it. Within a procedure, you can declare an array using the ReDim statement with numeric expressions to define the range of the field sizes.</paragraph> 77<paragraph role="heading" id="hd_id3148405" xml-lang="en-US" level="2" l10n="U" oldref="28">Example:</paragraph> 78<paragraph role="paragraph" id="par_id3154362" xml-lang="en-US" l10n="U" oldref="29">Sub ExampleRedim</paragraph> 79<paragraph role="paragraph" id="par_id3150042" xml-lang="en-US" l10n="U" oldref="30">Dim iVar() As Integer, iCount As Integer</paragraph> 80<paragraph role="paragraph" id="par_id3147339" xml-lang="en-US" l10n="U" oldref="31">ReDim iVar(5) As integer</paragraph> 81<paragraph role="paragraph" id="par_id3149106" xml-lang="en-US" l10n="U" oldref="32">For iCount = 1 To 5</paragraph> 82<paragraph role="paragraph" id="par_id3155174" xml-lang="en-US" l10n="U" oldref="33">iVar(iCount) = iCount</paragraph> 83<paragraph role="paragraph" id="par_id3163805" xml-lang="en-US" l10n="U" oldref="34">Next iCount</paragraph> 84<paragraph role="paragraph" id="par_id3149568" xml-lang="en-US" l10n="U" oldref="35">ReDim iVar(10) As integer</paragraph> 85<paragraph role="paragraph" id="par_id3147364" xml-lang="en-US" l10n="U" oldref="36">For iCount = 1 To 10</paragraph> 86<paragraph role="paragraph" id="par_id3155335" xml-lang="en-US" l10n="U" oldref="37">iVar(iCount) = iCount</paragraph> 87<paragraph role="paragraph" id="par_id3154662" xml-lang="en-US" l10n="U" oldref="38">Next iCount</paragraph> 88<paragraph role="paragraph" id="par_id3149926" xml-lang="en-US" l10n="U" oldref="39">end sub</paragraph> 89</body> 90</helpdocument> 91