<?php { $operator=$_REQUEST['operator']; if($operator=="+") { $add1 = $_REQUEST['fvalue']; $add2 = $_REQUEST['lvalue']; $res= $add1+$add2; } if($operator=="-") { $add1 = $_REQUEST['fvalue']; $add2 = $_REQUEST['lvalue']; $res= $add1-$add2; } if($operator=="*") { $add1 = $_REQUEST['fvalue']; $add2 = $_REQUEST['lvalue']; $res =$add1*$add2; } if($operator=="/") { $add1 = $_REQUEST['fvalue']; $add2 = $_REQUEST['lvalue']; $res= $add1/$add2; } if($_REQUEST['fvalue']==NULL && $_REQUEST['lvalue']==NULL) { echo "<script language=javascript> alert(\"Please Enter values.\");</script>"; } else if($_REQUEST['fvalue']==NULL) { echo "<script language=javascript> alert(\"Please Enter First value.\");</script>"; } else if($_REQUEST['lvalue']==NULL) { echo "<script language=javascript> alert(\"Please Enter second value.\");</script>"; } } ?>
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