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    copied!<pre><code>&lt;html xmlns="http://www.w3.org/1999/xhtml"&gt; &lt;head runat="server"&gt; &lt;title&gt;&lt;/title&gt; &lt;script language="javascript" type="text/javascript"&gt; function Add() { var x, y, txtResult; x = document.getElementById('txtFirst').value; y = document.getElementById('txtSecond').value; if (x == " " || y == "") { alert("Please enter FirstValue and SecondValue"); } else{ var txtResult = +x + +y; document.getElementById('txtResult').innerHTML = "Result: " + txtResult; } } function Sub() { var x, y, txtResult; x = document.getElementById('txtFirst').value; y = document.getElementById('txtSecond').value; if (x == " " || y == "") { alert("Please enter FirstValue and SecondValue"); } else { var txtResult = +x - +y; document.getElementById('txtResult').innerHTML = "Result: " + txtResult; } } function Mul() { var x, y, txtResult; x = document.getElementById('txtFirst').value; y = document.getElementById('txtSecond').value; if (x == " " || y == "") { alert("Please enter FirstValue and SecondValue"); } else { var txtResult = +x * +y; document.getElementById('txtResult').innerHTML = "Result: " + txtResult; } } function Div() { var x, y, txtResult; x = document.getElementById('txtFirst').value; y = document.getElementById('txtSecond').value; if (x == " " || y == "") { alert("Please enter FirstValue and SecondValue"); } else if (y != 0) { var txtResult = +x / +y; } else { alert("Second Number Should not be Zero"); } document.getElementById('txtResult').innerHTML = "Result: " + txtResult; } function Clear() { document.getElementById('txtFirst').value = ""; document.getElementById('txtSecond').value = ""; document.getElementById('txtResult').value = ""; } &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;form id="form1" runat="server"&gt; &lt;div&gt; &lt;label&gt; FirstNumber :&lt;/label&gt;&lt;br /&gt; &lt;input id="txtFirst" type="text" /&gt;&lt;br /&gt; &lt;label&gt; Second Number :&lt;/label&gt;&lt;br /&gt; &lt;input id="txtSecond" type="text" /&gt;&lt;br /&gt; &lt;label id="txtResult"&gt;&lt;/label&gt;&lt;br /&gt; &lt;input id="btnAdd" type="button" value="ADD" onclick="Add()"/&gt; &lt;input id="btnSub" type="button" value="SUB" onclick="Sub()"/&gt;&lt;br /&gt; &lt;input id="btnMul" type="button" value="MUL" onclick="Mul()"/&gt; &lt;input id="btnDiv" type="button" value="DIV" onclick="Div()"/&gt; &lt;input id="btnClear" type="button" value="Clear" onclick="Clear()"/&gt; &lt;/div&gt; &lt;/form&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p><img src="https://i.stack.imgur.com/IHbWJ.png" alt="enter image description here"></p>
 

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