<h3>upper() function</h3>
Converts a string to upper case letters.

<p><h4>Syntax</h4>
     upper(<i>string</i>)</p>

<p><h4>Arguments</h4>
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<i>  string</i> &rarr; is string.  The String to convert to upper case.</p>

<p><h4>Example</h4>
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     upper('hello WOrld') &rarr; 'HELLO WORLD'</p>
