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19 lines
2.1 KiB
HTML
<html><body><div class="content"><div class="section" id="the-while-statement">
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<span id="while"></span><h2>The <a class="reference internal" href="#while"><tt class="xref std std-keyword docutils literal"><span class="pre">while</span></tt></a> statement</h2>
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<p id="index-4">The <a class="reference internal" href="#while"><tt class="xref std std-keyword docutils literal"><span class="pre">while</span></tt></a> statement is used for repeated execution as long as an
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expression is true:</p>
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<pre>
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<strong id="grammar-token-while_stmt">while_stmt</strong> ::= "while" <a class="reference internal" href="expressions.html#grammar-token-expression"><tt class="xref docutils literal"><span class="pre">expression</span></tt></a> ":" <a class="reference internal" href="#grammar-token-suite"><tt class="xref docutils literal"><span class="pre">suite</span></tt></a>
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["else" ":" <a class="reference internal" href="#grammar-token-suite"><tt class="xref docutils literal"><span class="pre">suite</span></tt></a>]
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</pre>
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<p>This repeatedly tests the expression and, if it is true, executes the first
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suite; if the expression is false (which may be the first time it is tested) the
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suite of the <a class="reference internal" href="#else"><tt class="xref std std-keyword docutils literal"><span class="pre">else</span></tt></a> clause, if present, is executed and the loop
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terminates.</p>
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<p id="index-5">A <a class="reference internal" href="simple_stmts.html#break"><tt class="xref std std-keyword docutils literal"><span class="pre">break</span></tt></a> statement executed in the first suite terminates the loop
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without executing the <a class="reference internal" href="#else"><tt class="xref std std-keyword docutils literal"><span class="pre">else</span></tt></a> clause’s suite. A <a class="reference internal" href="simple_stmts.html#continue"><tt class="xref std std-keyword docutils literal"><span class="pre">continue</span></tt></a>
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statement executed in the first suite skips the rest of the suite and goes back
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to testing the expression.</p>
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</div>
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</div></body></html>
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