<!DOCTYPE html>
<html>
<head>
<title>JavaScript Exercise</title>
<script type="text/javascript">
function exercise(){
var stringsource = "A man and a pen";
var result = "stringsource = " + stringsource + "\n\n";
result += "toUpperCase(): " + stringsource.toUpperCase() + "\n";
result += "toLowerCase(): " + stringsource.toLowerCase() + "\n";
alert(result);
}
function htmlonload(){
exercise();
}
</script>
</head>
<body onload="htmlonload();">
JavaScript Exercise
</body>
</html>
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