projects / deliverable / titan.core.git / blame
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| 970ed795 | 1 | <!-- |
| 3abe9331 | 2 | Copyright (c) 2000-2015 Ericsson Telecom AB |
| 970ed795 EL |
3 | |
| 4 | All rights reserved. This program and the accompanying materials | |
| 5 | are made available under the terms of the Eclipse Public License v1.0 | |
| 6 | which accompanies this distribution, and is available at | |
| 7 | http://www.eclipse.org/legal/epl-v10.html | |
| 8 | --> | |
| 9 | <html> | |
| 10 | <head> | |
| 11 | <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> | |
| 12 | <meta http-equiv="Content-Language" content="en-us"> | |
| 13 | <title>for</title> | |
| 14 | </head> | |
| 15 | <body bgcolor="#DAD3C5" vlink="#0094D2" link="#003258"> | |
| 16 | <table align="left" border="0" cellspacing="0" cellpadding="0" valign=top> | |
| 17 | <tr> | |
| 18 | <td width=105 height=40><a href="https://projects.eclipse.org/projects/tools.titan"><img src="../images/titan_transparent.gif" border=0 width=105 height=40 align="left" alt="Titan"></a></td> | |
| 19 | </tr> | |
| 20 | </table> | |
| 21 | <table border="0" align="right" cellpadding="0" cellspacing="0"> | |
| 22 | <tr> | |
| 23 | <td><a href="../titan_main.html" alt="contents"><img border="0" src="../images/ao.jpg" width="53" height="40"></a></td> | |
| 24 | <td><a href="../titan_index.html" alt="index"><img border="0" src="../images/up.jpg" width="53" height="40"></a></td> | |
| 25 | <td><a href="float2str.html" alt="previous"><img border="0" src="../images/left.jpg" width="53" height="40"></a></td> | |
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| 27 | </tr> | |
| 28 | </table> | |
| 29 | <p><br clear="all"> | |
| 30 | </p> | |
| 31 | <hr> | |
| 32 | <h1>for</h1> | |
| 33 | <hr align="left" width="75%"> | |
| 34 | <p>The keyword defines a counter loop. The value of the index variable is increased, decreased or manipulated in such a way that after a certain number of execution loops a termination criterion | |
| 35 | is reached.</p> | |
| 36 | <ul> | |
| 37 | <li>The index variable can be declared in the statement header. By doing so, the scope of the index variable will be limited to the loop.</li> | |
| 38 | </ul> | |
| 39 | <hr align="left" width="50%"> | |
| 40 | <div align="center"> | |
| 41 | <center> | |
| 42 | <table border="0" width="90%" bgcolor="#FFB599" cellpadding="4"> | |
| 43 | <tr> | |
| 44 | <td width="100%"> | |
| 45 | <h3 align="center"><font face="Courier New" color="#003258" size="5"><b>for (</b></font>[ <i>index_variable_declaration</i> ]<i> initial_value</i><font face="Courier New" color="#003258" | |
| 46 | size="5"><b>;</b></font><i> condition</i><font face="Courier New" color="#003258" size="5"><b>;</b></font><i> manipulator_expression</i><font face="Courier New" color="#003258" size="5"><b>) | |
| 47 | {</b></font> <i> statement_block </i><font face="Courier New" color="#003258" size="5"><b>};</b></font></h3> | |
| 48 | </td> | |
| 49 | </tr> | |
| 50 | </table> | |
| 51 | </center> | |
| 52 | </div> | |
| 53 | <ul> | |
| 54 | <li> | |
| 55 | <p>The <font face="Courier New" color="#003258" size="4"><b>for</b></font> keyword introduces the loop.</p> | |
| 56 | </li> | |
| 57 | <li> | |
| 58 | <p><i>index_variable_declaration</i> is optional. When used, the variable will only be visible within the loop.</p> | |
| 59 | </li> | |
| 60 | <li> | |
| 61 | <p><i>initial_value</i> is used to initialize the index (or counter) variable of the loop.</p> | |
| 62 | </li> | |
| 63 | <li> | |
| 64 | <p><i>condition</i>is a Boolean expression. It is checked at the beginning of each new loop iteration. If it evaluates to false, the loop terminates.</p> | |
| 65 | </li> | |
| 66 | <li> | |
| 67 | <p><i>manipulator_expression</i> is stepping the index variable after each new loop iteration.</p> | |
| 68 | </li> | |
| 69 | <li> | |
| 70 | <p><i>statement_block</i> contains one or more statements. The block will be executed in a loop until <i>condition</i> is true.</p> | |
| 71 | </li> | |
| 72 | </ul> | |
| 73 | <hr align="left" width="50%"> | |
| 74 | <p>Example 1: | |
| 75 | <p><font face="Courier New">var integer j; <br> | |
| 76 | for (j:=1; j<=10; j:= j+2) { log ("index variable: ", j) }<br> | |
| 77 | </font> | |
| 78 | <p>The loop variable j is declared in the first line. In the second line, a loop is defined. The initial value of the index variable (j) is 1. The index variable is increased by 2 every time the | |
| 79 | loop was executed. The loop execution terminates when the index value will have a value greater than 10. The statement block contains a log instruction, which will be executed 5 times resulting in | |
| 80 | five lines in the log.</p> | |
| 81 | <hr align="left" width="25%"> | |
| 82 | <p>Example 2: | |
| 83 | <p><font face="Courier New">for (var integer jj:=1; jj<=10; jj:= jj+2) { log ("index variable: ", jj) }<br> | |
| 84 | </font> | |
| 85 | <p>The only difference to the first example is that the index variable (jj) now is declared within the loop. It means that it will not be visible outside the loop.</p> | |
| 86 | <hr align="left" width="25%"> | |
| 87 | <hr align="left" width="25%"> | |
| 88 | <p><a HREF="BNF.html#forstatement">BNF definition</a> of <font face="Courier New">for</font></p> | |
| 89 | </body> | |
| 90 | </html> |