<!--Script by hscripts.com-->
<!-- Free javascripts @ https://www.hscripts.com -->
<script type="text/javascript">
function rnd()
{
var num1=document.getElementById("no1").value;
var num2=document.getElementById("no2").value
var op=document.getElementById("op").value;
var rn=document.getElementById("rd").value;
var res;
num1=parseFloat(num1);
num2=parseFloat(num2);
if(isNaN(num1) || isNaN(num2))
{
alert("please check the number entered by you");
}
else
{
switch(op)
{
case "+" :
res=num1+num2;
break;
case "-" :
res=num1-num2;
break;
case "/" :
res=num1/num2;
break;
case "*" :
res=num1*num2;
break;
case "%" :
res=num1%num2;
break;
}
}
var rs = new Number(res);
var lrs=rs.toFixed(rn);
document.getElementById("res").value=lrs;
}
function ncheck(event,no)
{
var kc;
if(window.event)
{
kc=event.keyCode;
}
else
{
kc=event.which;
}
var num=no.value;
if(kc==46)
{
if(num.indexOf(".")==-1)
{
return true;
}
else
{
return false;
}
}
if(kc==45)
{
if(num=="")
{
return true;
}
else
{
return false;
}
}
if(kc==48)
{
if(num.indexOf("-")==0 && num.length==1)
{
return false;
}
if(num=="")
{
return false;
}
else
{
return true;
}
}if (kc!=8 && kc!=0)
{
if (kc<49||kc>57)
{
return false;
}
}
}
function elzero(num)
{
var no=num.value;
if(parseInt(no.charAt(0))==0)
{
while(parseInt(no.charAt(0)) == 0)
{
num.value=no.substring(1);
}
}
}
</script>
<!-- Script by hscripts.com -->

<!--Script by hscripts.com-->
<!-- Free javascripts @ https://www.hscripts.com -->
<form name="frm1">
<table>
<tr><td align="center" style="color: #3D366F; font-size:13px;">FirstNumber</td><td align="center" style="color: #3D366F; font-size:13px;">Operator</td><td align="center" style="color: #3D366F; font-size:13px;">SecondNumber</td></tr>
<tr><td align="center" style="color: #3D366F; font-size:13px;text-decoration:none;cursor:pointer;"><input type="text" name="no1" id="no1" size="5" onkeypress="return ncheck(event,no1)" onblur="elzero(no1)"></td>
<td align="center"><select name="op" id="op">
<option value="+" default>+</option>
<option value="-">-</option>
<option value="/">/</option>
<option value="*">*</option>
<option value="%">%</option>
</select></td>
<td
align="center"><input type="text" name="no2" id="no2" size="5" onkeypress="return ncheck(event,no2)"></td></tr><tr></tr>
<tr><td colspan="3" align="center" style="color: #3D366F; font-size:13px;">Round Decimal Upto 
<select name="rd" id="rd">
<script type="text/javascript">
for(var i=1;i<=10;i++)
{
document.write("<option value="+i+">"+i+"</option>");
}
</script>
</select></td>
</tr><tr></tr><tr><td colspan="3" align="center"><input type="button" value="Calculate" onclick="rnd()"></td></tr>
</table><br>
<table>
<tr><td colspan="1" align="right" style="color: #3D366F; font-size:13px;">Result <input type="text" name="res" id="res" readonly></td></tr>
</table>
&copy;<a href="https://www.hscripts.com">hscripts.com</a></form>
<!-- Script by hscripts.com -->