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Calculator.html
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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Simple Calculator</title>
<script src="https://cdn.tailwindcss.com"></script>
</head>
<style>
#display {
outline: none;
}
</style>
<body class="bg-gray-100">
<div class="flex justify-center items-center h-screen">
<div class="bg-white p-6 rounded-lg shadow-md">
<div class="border border-gray-300 rounded-lg p-2 mb-4">
<input
type="text"
id="display"
class="w-full text-right text-xl font-bold"
readonly
/>
</div>
<div class="grid grid-cols-4 gap-2">
<button
class="operator bg-gray-200 hover:bg-gray-300 rounded-lg p-4"
onclick="appendToDisplay('(')"
>
(
</button>
<button
class="operator bg-gray-200 hover:bg-gray-300 rounded-lg p-4"
onclick="appendToDisplay(')')"
>
)
</button>
<button
class="operator bg-gray-200 hover:bg-gray-300 rounded-lg p-4"
onclick="clearDisplay()"
>
C
</button>
<button
class="operator bg-gray-200 hover:bg-gray-300 text-black rounded-lg p-4"
onclick="appendToDisplay('+')"
>
+
</button>
<button
class="number bg-gray-400 hover:bg-gray-500 text-white rounded-lg p-4"
onclick="appendToDisplay('7')"
>
7
</button>
<button
class="number bg-gray-400 hover:bg-gray-500 text-white rounded-lg p-4"
onclick="appendToDisplay('8')"
>
8
</button>
<button
class="number bg-gray-400 hover:bg-gray-500 text-white rounded-lg p-4"
onclick="appendToDisplay('9')"
>
9
</button>
<button
class="operator bg-gray-200 hover:bg-gray-300 rounded-lg p-4"
onclick="appendToDisplay('/')"
>
/
</button>
<button
class="number bg-gray-400 hover:bg-gray-500 text-white rounded-lg p-4"
onclick="appendToDisplay('4')"
>
4
</button>
<button
class="number bg-gray-400 hover:bg-gray-500 text-white rounded-lg p-4"
onclick="appendToDisplay('5')"
>
5
</button>
<button
class="number bg-gray-400 hover:bg-gray-500 text-white rounded-lg p-4"
onclick="appendToDisplay('6')"
>
6
</button>
<button
class="operator bg-gray-200 hover:bg-gray-300 rounded-lg p-4"
onclick="appendToDisplay('*')"
>
*
</button>
<button
class="number bg-gray-400 hover:bg-gray-500 text-white rounded-lg p-4"
onclick="appendToDisplay('1')"
>
1
</button>
<button
class="number bg-gray-400 hover:bg-gray-500 text-white rounded-lg p-4"
onclick="appendToDisplay('2')"
>
2
</button>
<button
class="number bg-gray-400 hover:bg-gray-500 text-white rounded-lg p-4"
onclick="appendToDisplay('3')"
>
3
</button>
<button
class="operator bg-gray-200 hover:bg-gray-300 rounded-lg p-4"
onclick="appendToDisplay('-')"
>
-
</button>
<button
class="number bg-gray-400 hover:bg-gray-500 text-white rounded-lg p-4"
onclick="appendToDisplay('0')"
>
0
</button>
<button
class="number bg-gray-400 hover:bg-gray-500 text-white rounded-lg p-4"
onclick="appendToDisplay('.')"
>
.
</button>
<button
class="operator bg-orange-400 hover:bg-orange-600 text-white text-lg rounded-lg p-4 col-span-2"
onclick="calculate()"
>
=
</button>
</div>
</div>
</div>
<script>
function appendToDisplay(value) {
document.getElementById("display").value += value;
}
function clearDisplay() {
document.getElementById("display").value = "";
}
function calculate() {
try {
let result = eval(document.getElementById("display").value);
document.getElementById("display").value = result;
} catch (error) {
document.getElementById("display").value = "Error";
}
}
</script>
</body>
</html>