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| 22 | <title>break Statement (GNU C Language Manual)</title>
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| 30 | <link href="Symbol-Index.html" rel="index" title="Symbol Index">
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| 31 | <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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| 32 | <link href="Loop-Statements.html" rel="up" title="Loop Statements">
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| 33 | <link href="for-Statement.html" rel="next" title="for Statement">
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| 57 | <body lang="en">
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| 58 | <span id="break-Statement"></span><div class="header">
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| 59 | <p>
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| 60 | Next: <a href="for-Statement.html" accesskey="n" rel="next">for Statement</a>, Previous: <a href="do_002dwhile-Statement.html" accesskey="p" rel="prev">do-while Statement</a>, Up: <a href="Loop-Statements.html" accesskey="u" rel="up">Loop Statements</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Symbol-Index.html" title="Index" rel="index">Index</a>]</p>
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| 61 | </div>
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| 62 | <hr>
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| 63 | <span id="break-Statement-1"></span><h4 class="subsection">19.6.3 <code>break</code> Statement</h4>
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| 64 | <span id="index-break-statement"></span>
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| 65 | <span id="index-statement_002c-break"></span>
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| 66 | <span id="index-break"></span>
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| 67 |
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| 68 | <p>The <code>break</code> statement looks like ‘<samp>break;</samp>’. Its effect is to
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| 69 | exit immediately from the innermost loop construct or <code>switch</code>
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| 70 | statement (see <a href="switch-Statement.html">switch Statement</a>).
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| 71 | </p>
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| 72 | <p>For example, this loop advances <code>p</code> until the next null
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| 73 | character or newline.
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| 74 | </p>
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| 75 | <div class="example">
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| 76 | <pre class="example">while (*p)
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| 77 | {
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| 78 | /* <span class="roman">End loop if we have reached a newline.</span> */
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| 79 | if (*p == '\n')
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| 80 | break;
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| 81 | p++
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| 82 | }
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| 83 | </pre></div>
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| 84 |
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| 85 | <p>When there are nested loops, the <code>break</code> statement exits from the
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| 86 | innermost loop containing it.
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| 87 | </p>
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| 88 | <div class="example">
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| 89 | <pre class="example">struct list_if_tuples
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| 90 | {
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| 91 | struct list_if_tuples next;
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| 92 | int length;
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| 93 | data *contents;
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| 94 | };
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| 95 |
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| 96 | void
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| 97 | process_all_elements (struct list_if_tuples *list)
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| 98 | {
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| 99 | while (list)
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| 100 | {
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| 101 | /* <span class="roman">Process all the elements in this node’s vector,</span>
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| 102 | <span class="roman">stopping when we reach one that is null.</span> */
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| 103 | for (i = 0; i < list->length; i++
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| 104 | {
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| 105 | /* <span class="roman">Null element terminates this node’s vector.</span> */
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| 106 | if (list->contents[i] == NULL)
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| 107 | /* <span class="roman">Exit the <code>for</code> loop.</span> */
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| 108 | break;
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| 109 | /* <span class="roman">Operate on the next element.</span> */
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| 110 | process_element (list->contents[i]);
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| 111 | }
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| 112 |
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| 113 | list = list->next;
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| 114 | }
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| 115 | }
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| 116 | </pre></div>
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| 117 |
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| 118 | <p>The only way in C to exit from an outer loop is with
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| 119 | <code>goto</code> (see <a href="goto-Statement.html">goto Statement</a>).
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| 120 | </p>
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| 121 |
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| 122 |
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| 123 |
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