tinycalculator.php

<?php
/**
 * Module Name: Tiny Calculator
 * Module ID: tinycalculator
 * Description: Provides a calculator for simple mathematical functions.
 * Version: 1.0
 * Default W: 3
 * Default H: 4
 */
 
if (!defined('IN_GS')) { die('You cannot load this page directly.'); }

?>


<style>
.calc-parent {
	display: flex;
	justify-content: center;
}
.calc{
	width:200px;
	font-family:sans-serif;
}

#display{
	width:100%;
	height:40px;
	font-size:18px;
	text-align:right;
	margin-bottom:5px;
	padding:5px;
}

.buttons{
	display:grid;
	grid-template-columns:repeat(4,1fr);
	gap:4px;
}

button{
	padding:10px;
	font-size:16px;
	cursor:pointer;
}

.clear{
	background:#F18484;
	color:white;
}

.total{
	grid-column:span 4;
	background:#78DB78;
	color:white;
}
</style>

<div class="calc-parent">
	<div class="calc">
		<input type="text" id="display" readonly>

		<div class="buttons">
			<button onclick="add('7')">7</button>
			<button onclick="add('8')">8</button>
			<button onclick="add('9')">9</button>
			<button onclick="add('/')">÷</button>

			<button onclick="add('4')">4</button>
			<button onclick="add('5')">5</button>
			<button onclick="add('6')">6</button>
			<button onclick="add('*')">×</button>

			<button onclick="add('1')">1</button>
			<button onclick="add('2')">2</button>
			<button onclick="add('3')">3</button>
			<button onclick="add('-')">−</button>

			<button onclick="add('0')">0</button>
			<button onclick="add('.')">.</button>
			<button class="clear" onclick="clearDisplay()">C</button>
			<button onclick="add('+')">+</button>

			<button class="total" onclick="calc()">=</button>
		</div>
	</div>
</div>

<script>
function add(val){
	document.getElementById("display").value += val;
}

function calc(){
	try{
		document.getElementById("display").value =
			eval(document.getElementById("display").value);
	}catch{
		document.getElementById("display").value = "Error";
	}
}

function clearDisplay(){
	document.getElementById("display").value = "";
}
</script>