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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Function library example</title>
<style>
input {
font-size: 2em;
margin: 10px 1px 0;
}
</style>
</head>
<body>
<input class="numberInput" type="text">
<p></p>
<script>
var input = document.querySelector('.numberInput');
var para = document.querySelector('p');
function squared(num) {
return num * num;
}
function cubed(num) {
return num * num * num;
}
function factorial(num) {
var x = num;
while(x > 1) {
num *= x-1;
x--;
}
return num;
}
input.onchange = function() {
var num = input.value;
if(isNaN(num)) {
para.textContent = 'You need to enter a number!';
} else {
para.textContent = num + ' squared is ' + squared(num) + '. ' +
num + ' cubed is ' + cubed(num) + '. ' +
num + ' factorial is ' + factorial(num) + '.';
}
}
</script>
</body>
</html>
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