## JavaScript calculator program

Design a form that accepts two integers. Provide 4 buttons for Add, Subtract, Multiply, Divide. Add JavaScript program to add, subtract, multiply and divide the given numbers when these buttons are clicked. Use output element to display the results

```<html>

<script>
var a = parseInt(document.getElementById('a').value);
var b = parseInt(document.getElementById('b').value);
r = a + b;
document.getElementById("result").innerHTML = a + " + " + b + " = " + r;
}

function sub() {
var a = parseInt(document.getElementById('a').value);
var b = parseInt(document.getElementById('b').value);
r = a - b;
document.getElementById("result").innerHTML = a + " - " + b + " = " + r;
}

function mul() {
var a = parseInt(document.getElementById('a').value);
var b = parseInt(document.getElementById('b').value);
r = a * b;
document.getElementById("result").innerHTML = a + " * " + b + " = " + r;
}

function div() {
var a = parseInt(document.getElementById('a').value);
var b = parseInt(document.getElementById('b').value);
r = a / b;
document.getElementById("result").innerHTML = a + " / " + b + " = " + r;
}
</script>

<body>

<h1>Calculator</h1>
<form>
Enter number 1:
<input type="text" id="a" /><br />
Enter number 2:
<input type="text" id="b" /><br />
<input type="button" value="Subtract" onClick="sub()" />
<input type="button" value="Multiply" onClick="mul()" />
<input type="button" value="Divide" onClick="div()" />
</form>
<p id="result"></p>

</body>

</html>```
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