Interested to Buy Any Domain ? << Click Here >> for more details...
Write a javascript program to make a simple calculator
- 11 Answers
- 71448 Views
- Anand Group, TCS, I also Faced
- E-Mail Answers
Answer Posted / mehta fenil & bodiwala rum
<html>
<head>
<title>Basic Calculator</title>
<script language="JavaScipt" type="text/JavaScript">
var adddigit=false;
var oldval=0;
var op="=";
function btnconcat(c)
{
if(adddigit)
{
document.getElementById("txtdisplay").value+=c;
}
else
{
document.getElementById("txtdisplay").value=c;
adddigit=true;
}
}
function operation(newop)
{
var newarg=eval(document.getElementById("txtdisplay").value)
if(op=="+")
{
oldval=oldval+newarg;
}
else if(op=="-")
{
oldval=oldval-newarg;
}
else if(op=="*")
{
oldval=oldval*newarg;
}
else if(op=="/")
{
oldval=oldval/newarg;
}
else if(op=="=")
{
oldval=newarg;
}
else
{
oldval=newarg;
}
document.getElementById("txtdisplay").value=oldval;
adddigit=false;
op=newop;
}
function backspace()
{
document.getElementById("txtdisplay").value=document.getElementById("txtdisplay").value.substring(0,document.getElementById("txtdisplay").value.length*1-1);
}
function btnce()
{
document.getElementById("txtdisplay").value="";
}
function btnc()
{
document.getElementById("txtdisplay").value=0;
oldval=0;
adddigit=false;
op="=";
}
</script>
</head>
<body>
<center>
<table border=5 cellpading=5 cellspacing=5>
<tr>
<td colspan="4"><input type="text" id="txtdisplay"
size="25" style="text-align:right"></td>
</tr>
<tr>
<td>
<center>
<input type="button" id="btnc" value="C"
onClick="btnc();">
</center>
</td>
<td>
</td>
<td>
<center>
<input name="Button" type="button" id="btnc"
onClick="btnce();" value="CE">
</center>
</td>
<td>
<center>
<input type="button" id="btnc" value="<="
onClick="backspace();">
</center>
</td>
</tr>
<tr>
<td>
<center>
<input type="button" id="btn7" value="7"
onClick="btnconcat(7);">
</center>
</td>
<td>
<center>
<input type="button" id="btn8" value="8"
onClick="btnconcat(8);">
</center>
</td>
<td>
<center>
<input type="button" id="btn9" value="9"
onClick="btnconcat(9);">
</center>
</td>
<td>
<center>
<input type="button" id="btnpls" value="+"
onClick="operation('+');">
</center>
</td>
</tr>
<tr>
<td>
<center>
<input type="button" id="btn4" value="4"
onClick="btnconcat(4);">
</center>
</td>
<td>
<center>
<input type="button" id="btn5" value="5"
onClick="btnconcat(5);">
</center>
</td>
<td>
<center>
<input type="button" id="btn6" value="6"
onClick="btnconcat(6);">
</center>
</td>
<td>
<center>
<input type="button" id="btnmin" value="-"
onClick="operation('-');">
</center>
</td>
</tr>
<tr>
<td>
<center>
<input type="button" id="btn1" value="1"
onClick="btnconcat(1);">
</center>
</td>
<td>
<center>
<input type="button" id="btn2" value="2"
onClick="btnconcat(2);">
</center>
</td>
<td>
<center>
<input type="button" id="btn3" value="3"
onClick="btnconcat(3);">
</center>
</td>
<td>
<center>
<input type="button" id="btnmul" value="*"
onClick="operation('*');">
</center>
</td>
</tr>
<tr>
<td>
<center>
<input type="button" id="btnpoi" value="."
onClick="btnconcat('.');">
</center>
</td>
<td>
<center>
<input type="button" id="btn0" value="0"
onClick="btnconcat(0);">
</center>
</td>
<td>
<center>
<input type="button" id="btneql" value="="
onClick="operation(value)">
</center>
</td>
<td>
<center>
<input type="button" id="btndiv" value="/"
onClick="operation('/');">
</center>
</td>
</tr>
</table>
</center>
</body>
</html>
| Is This Answer Correct ? | 12 Yes | 3 No |
Post New Answer View All Answers
What is difference between ajax and javascript?
How to check if a variable is an integer in javascript ?
How can an HTMLCollection be traversed?
What are the scopes of a variable in javascript?
Will javascript be replaced?
How will you create new object in javascript?
What are the four basic data structures in javascript?
What does double mean in javascript?
If an array with name as "names" contain three elements, then how will you print the third element of this array?
How to reload a page using JavaScript?
Are javascript variables global?
Which is better for or foreach in javascript?
What does a typeof operator do?
What is the difference between let and var?
What are javascript properties?
