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<!DOCTYPE html>
<html>
<head>
<title>Calculator</title>
</head>
<body>
Enter Calculations:<br>
<textarea id="input" rows="20" cols="50">
3
2 ^ 8
(12 % 7) * (3 + 2)
19 / -9
hoursPerDay = 24
minutesPerHour = 60
minutesPerDay = minutesPerHour * hoursPerDay
minutesPerDay
minutesPerDay * 60
toDegrees(radians) = radians * 180 / pi
toDegrees(2 * pi)
cylinderVolume(r, h) = pi * r ^ 2 * h
cylinderVolume(2, 4)
</textarea><br>
<button id="calculate">Calculate</button>
<pre id="output"></pre>
<script>
if (!Object.create) {
Object.create = function (o) {
function F() { }
F.prototype = o;
return new F();
};
}
</script>
<script src="lexer.js"></script>
<script src="parser.js"></script>
<script src="evaluator.js"></script>
<script>
var calculate = function (input) {
try {
var tokens = lex(input);
var parseTree = parse(tokens);
var output = evaluate(parseTree);
return output;
} catch (e) {
return e;
}
};
document.getElementById("calculate").onclick = function () {
var input = document.getElementById("input").value;
output = calculate(input);
document.getElementById("output").innerHTML = output;
};
</script>
</body>
</html>
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