Code:
<!DOCTYPE html>
<html>
<body>
<h2>JavaScript Celcius to Fahrenhet</h2>
<p>Insert a number into one of the input fields below:</p>
<p><input id="c" onkeyup="convert('C')"> degrees Celsius</p>
<p><input id="f" onkeyup="convert('F')"> degrees Fahrenheit</p>
<p>Note that the <b>Math.round()</b> method is used, so that the result will be returned as an integer.</p>
<script>
function convert(degree) {
var x;
if (degree == "C") {
x = document.getElementById("c").value * 9 / 5 + 32;
document.getElementById("f").value = Math.round(x);
} else {
x = (document.getElementById("f").value -32) * 5 / 9;
document.getElementById("c").value = Math.round(x);
}
}
</script>
</body>
</html>Output:
Source: W3School
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