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<head>
<title>EAGLE Help: while</title>
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<i>EAGLE Help</i>
<h1><center>while</center></h1>
<hr>
The <i>while</i> statement has the general syntax
<pre>
while (condition) statement
</pre>
and executes the <tt>statement</tt> as long as the <tt>condition</tt>
expression is not zero.
<p>
The <tt>condition</tt> is tested <b>before</b> the first possible
execution of <tt>statement</tt>, which means that the statement may never
be executed if <tt>condition</tt> is initially zero.
<p>
If there is no
<tt><a href=219.htm>break</a></tt> or
<tt><a href=224.htm>return</a></tt>
inside the <tt>statement</tt>, the <tt>statement</tt> must affect
the value of the <tt>condition</tt>, or <tt>condition</tt> itself must
change during evaluation in order to avoid an endless loop.
<p>
<b>Example</b>
<pre>
string s = "Trust no one!";
int i = 0;
while (s[i])
++i;
</pre>
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