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="textsbasicshared03090201xml" indexer="include" status="PUBLISH"> 27<title id="tit" xml-lang="en-US">Do...Loop Statement [Runtime]</title> 28<filename>/text/sbasic/shared/03090201.xhp</filename> 29</topic> 30</meta> 31<body> 32<section id="doloop"> 33<bookmark xml-lang="en-US" branch="index" id="bm_id3156116"> 34<bookmark_value>Do...Loop statement</bookmark_value> 35<bookmark_value>While; Do loop</bookmark_value> 36<bookmark_value>Until</bookmark_value> 37<bookmark_value>loops</bookmark_value> 38</bookmark> 39<paragraph role="heading" id="hd_id3156116" xml-lang="en-US" level="1" l10n="U" oldref="1"><link href="text/sbasic/shared/03090201.xhp" name="Do...Loop Statement [Runtime]">Do...Loop Statement [Runtime]</link></paragraph> 40<paragraph role="paragraph" id="par_id3109850" xml-lang="en-US" l10n="U" oldref="2">Repeats the statements between the Do and the Loop statement while the condition is True or until the condition becomes True.</paragraph> 41</section> 42<paragraph role="heading" id="hd_id3149119" xml-lang="en-US" level="2" l10n="U" oldref="3">Syntax</paragraph> 43<paragraph role="paragraph" id="par_id3155150" xml-lang="en-US" l10n="U" oldref="4">Do [{While | Until} condition = True]</paragraph> 44<paragraph role="paragraph" id="par_id3154422" xml-lang="en-US" l10n="U" oldref="5">statement block</paragraph> 45<paragraph role="paragraph" id="par_id3150789" xml-lang="en-US" l10n="U" oldref="6">[Exit Do]</paragraph> 46<paragraph role="paragraph" id="par_id3155805" xml-lang="en-US" l10n="U" oldref="7">statement block</paragraph> 47<paragraph role="paragraph" id="par_id3145090" xml-lang="en-US" l10n="U" oldref="8">Loop</paragraph> 48<paragraph role="paragraph" id="par_id3154749" xml-lang="en-US" l10n="U" oldref="9">or</paragraph> 49<paragraph role="paragraph" id="par_id3150503" xml-lang="en-US" l10n="U" oldref="10">Do</paragraph> 50<paragraph role="paragraph" id="par_id3149762" xml-lang="en-US" l10n="U" oldref="11">statement block</paragraph> 51<paragraph role="paragraph" id="par_id3150984" xml-lang="en-US" l10n="U" oldref="12">[Exit Do]</paragraph> 52<paragraph role="paragraph" id="par_id3143228" xml-lang="en-US" l10n="U" oldref="13">statement block</paragraph> 53<paragraph role="paragraph" id="par_id3149235" xml-lang="en-US" l10n="U" oldref="14">Loop [{While | Until} condition = True]</paragraph> 54<paragraph role="heading" id="hd_id3156024" xml-lang="en-US" level="2" l10n="U" oldref="15">Parameters/Elements</paragraph> 55<paragraph role="paragraph" id="par_id3156344" xml-lang="en-US" l10n="U" oldref="16"> 56<emph>Condition:</emph> A comparison, numeric or string expression, that evaluates either True or False.</paragraph> 57<paragraph role="paragraph" id="par_id3149669" xml-lang="en-US" l10n="U" oldref="17"> 58<emph>Statement block:</emph> Statements that you want to repeat while or until the condition is True.</paragraph> 59<paragraph role="paragraph" id="par_id3150791" xml-lang="en-US" l10n="U" oldref="18">The <emph>Do...Loop</emph> statement executes a loop as long as, or until, a certain condition is True. The condition for exiting the loop must be entered following either the <emph>Do</emph> or the <emph>Loop</emph> statement. The following examples are valid combinations:</paragraph> 60<paragraph role="heading" id="hd_id3154366" xml-lang="en-US" level="2" l10n="U" oldref="19">Syntax</paragraph> 61<paragraph role="paragraph" id="par_id3145171" xml-lang="en-US" l10n="U" oldref="20">Do While condition = True</paragraph> 62<paragraph role="paragraph" id="par_id3149203" xml-lang="en-US" l10n="U" oldref="21">...statement block</paragraph> 63<paragraph role="paragraph" id="par_id3125864" xml-lang="en-US" l10n="U" oldref="22">Loop</paragraph> 64<paragraph role="paragraph" id="par_id3154124" xml-lang="en-US" l10n="U" oldref="24">The statement block between the Do While and the Loop statements is repeated so long as the condition is true.</paragraph> 65<paragraph role="paragraph" id="par_id3153968" xml-lang="en-US" l10n="U" oldref="25">Do Until condition = True</paragraph> 66<paragraph role="paragraph" id="par_id3154909" xml-lang="en-US" l10n="U" oldref="26">...statement block</paragraph> 67<paragraph role="paragraph" id="par_id3159151" xml-lang="en-US" l10n="U" oldref="27">Loop</paragraph> 68<paragraph role="paragraph" id="par_id3150440" xml-lang="en-US" l10n="U" oldref="29">The statement block between the Do Until and the Loop statements is repeated if the condition so long as the condition is false.</paragraph> 69<paragraph role="paragraph" id="par_id3153952" xml-lang="en-US" l10n="U" oldref="30">Do</paragraph> 70<paragraph role="paragraph" id="par_id3147349" xml-lang="en-US" l10n="U" oldref="31">...statement block</paragraph> 71<paragraph role="paragraph" id="par_id3159153" xml-lang="en-US" l10n="U" oldref="32">Loop While condition = True</paragraph> 72<paragraph role="paragraph" id="par_id3146985" xml-lang="en-US" l10n="U" oldref="34">The statement block between the Do and the Loop statements repeats so long as the condition is true.</paragraph> 73<paragraph role="paragraph" id="par_id3150488" xml-lang="en-US" l10n="U" oldref="35">Do</paragraph> 74<paragraph role="paragraph" id="par_id3153189" xml-lang="en-US" l10n="U" oldref="36">...statement block</paragraph> 75<paragraph role="paragraph" id="par_id3155411" xml-lang="en-US" l10n="U" oldref="37">Loop Until condition = True</paragraph> 76<paragraph role="paragraph" id="par_id3151117" xml-lang="en-US" l10n="U" oldref="39">The statement block between the Do and the Loop statements repeats until the condition is true.</paragraph> 77<paragraph role="paragraph" id="par_id3149484" xml-lang="en-US" l10n="U" oldref="41">Use the <emph>Exit Do</emph> statement to unconditionally end the loop. You can add this statement anywhere in a <emph>Do</emph>...<emph>Loop</emph> statement. You can also define an exit condition using the <emph>If...Then</emph> structure as follows:</paragraph> 78<paragraph role="paragraph" id="par_id3149262" xml-lang="en-US" l10n="U" oldref="42">Do...</paragraph> 79<paragraph role="paragraph" id="par_id3149298" xml-lang="en-US" l10n="U" oldref="43">statements</paragraph> 80<paragraph role="paragraph" id="par_id3145646" xml-lang="en-US" l10n="U" oldref="44">If condition = True Then Exit Do</paragraph> 81<paragraph role="paragraph" id="par_id3154490" xml-lang="en-US" l10n="U" oldref="45">statements</paragraph> 82<paragraph role="paragraph" id="par_id3153159" xml-lang="en-US" l10n="U" oldref="46">Loop...</paragraph> 83<paragraph role="heading" id="hd_id3147396" xml-lang="en-US" level="2" l10n="U" oldref="47">Example</paragraph> 84<paragraph role="code" id="par_id3144764" xml-lang="en-US" l10n="U" oldref="49">Sub ExampleDoLoop</paragraph> 85<paragraph role="code" id="par_id3154791" xml-lang="en-US" l10n="U" oldref="50">Dim sFile As String</paragraph> 86<paragraph role="code" id="par_id3149401" xml-lang="en-US" l10n="U" oldref="51">Dim sPath As String</paragraph> 87<paragraph role="code" id="par_id3155600" xml-lang="en-US" l10n="U" oldref="52">sPath = "c:\"</paragraph> 88<paragraph role="code" id="par_id3150717" xml-lang="en-US" l10n="U" oldref="53">sFile = Dir$( sPath ,22)</paragraph> 89<paragraph role="code" id="par_id3146898" xml-lang="en-US" l10n="U" oldref="54">If sFile <> "" Then</paragraph> 90<paragraph role="code" id="par_id3156333" xml-lang="en-US" l10n="U" oldref="55">Do</paragraph> 91<paragraph role="code" id="par_id3153947" xml-lang="en-US" l10n="U" oldref="56">MsgBox sFile</paragraph> 92<paragraph role="code" id="par_id3150327" xml-lang="en-US" l10n="U" oldref="57">sFile = Dir$</paragraph> 93<paragraph role="code" id="par_id3150749" xml-lang="en-US" l10n="U" oldref="58">Loop Until sFile = ""</paragraph> 94<paragraph role="code" id="par_id3153765" xml-lang="en-US" l10n="U" oldref="59">End If</paragraph> 95<paragraph role="code" id="par_id3148914" xml-lang="en-US" l10n="U" oldref="60">End Sub</paragraph> 96</body> 97</helpdocument> 98