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<?php session_start(); // calculator session 4 ?> <FONT color=blue size=4> <?php $op = $_POST['op']; // "add", $num1 = $_SESSION['v1']; $num2 = $_SESSION['v2']; print "The num1 is $num1<BR>"; print "The num2 is $num2<BR>"; print "The operator is $op <HR>"; if($op == "add") { $ans = $num1 + $num2; print "$num1 + $num2 = $ans"; } else if($op == "sub") { $ans = $num1 - $num2; print "$num1 - $num2 = $ans"; } else if($op == "mul") { $ans = $num1 * $num2; print "$num1 * $num2 = $ans"; } else if($op == "div") { $ans = $num1 / $num2; print "$num1 / $num2 = $ans"; } else if($op == "mod") { $ans = $num1 % $num2; print "$num1 % $num2 = $ans"; } else if($op == "pow") { $ans = pow($num1, $num2); print "$num1 ^ $num2 = $ans"; } ?> </FONT>