Calculators
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<!-- A simplu calculator by Serban Nicolae @2004 orfeu@as.ro -->
<html>
<head>
<title>A simple calculator !</title>
</head>
<body>
<h3> A simple calculator </h3>
<form method="post" action="calculator.php">
<input type="text" size="6" name="op1" value="<? echo $op1 ?>" >
<select name="o"> <option value="1">+</option>
<option value="2">-</option>
<option value="3">*</option>
<option value="4">/</option>
</select>
<input type="text" size="6" name="op2" value="<? echo $op2 ?>" >
<br>
<input name="text" type="text" name="op3" value="
<?php
switch ($o)
{ case 1: $op3=$op1+$op2; break;
case 2: $op3=$op1-$op2; break;
case 3: $op3=$op1*$op2; break;
case 4: $op3=$op1/$op2; break;
}
echo $op3;
?>" disabled>
<input type="submit" value="=" >
</form>
</body>
</html>
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