CHAANGU CALCULATOR
About this app
CHAANGU CALCULATOR is a fun and colorful calculator app that includes all the functionalities of a standard calculator with an additional decimal point.
Simple Calculator Simple Calculator 7 8 9 / 4 5 6 * 1 2 3 - 0 . = + C DEL
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Source
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>Simple Calculator</title>
<meta name="description" content="Simple Calculator is a fun and colorful calculator app that includes all the functionalities of a standard calculator with the additional capability of handling decimal points.">
<meta name="keywords" content="calculator, simple calculator, decimal point, math, arithmetic, web app, fun app">
<link href="https://fonts.googleapis.com/css2?family=Roboto:wght@400&display=swap" rel="stylesheet">
<style>
body {
font-family: 'Roboto', sans-serif;
background: linear-gradient(to right, #6a11cb, #2575fc);
color: white;
}
#main-container {
margin: 50px auto;
text-align: center;
border-radius: 15px;
padding: 20px;
box-shadow: 0 0 25px rgba(0, 0, 0, 0.5);
background: rgba(255, 255, 255, 0.15);
}
input {
margin-bottom: 15px;
font-size: 32px;
text-align: right;
width: 100%;
border: none;
background: transparent;
color: white;
border-bottom: 2px solid white;
}
.btn {
background-color: #4caf50;
color: white;
font-size: 24px;
margin: 5px;
padding: 15px;
border: none;
border-radius: 5px;
transition: background-color 0.3s;
}
.btn:hover {
background-color: #388e3c;
}
</style>
<script type="text/javascript">
document.addEventListener("DOMContentLoaded", function() {
let currentInput = "";
let operation = null;
let previousInput = "";
function updateDisplay() {
document.getElementById("display").value = currentInput || "0";
}
function handleNumber(num) {
currentInput += num;
updateDisplay();
}
function handleOperation(op) {
if (currentInput === "") return;
if (previousInput !== "") {
calculate();
}
operation = op;
previousInput = currentInput;
currentInput = "";
}
function calculate() {
let result;
const prev = parseFloat(previousInput);
const current = parseFloat(currentInput);
if (isNaN(prev) || isNaN(current)) return;
switch (operation) {
case "+":
result = prev + current;
break;
case "-":
result = prev - current;
break;
case "*":
result = prev * current;
break;
case "/":
result = prev / current;
break;
default:
return;
}
currentInput = result.toString();
operation = null;
previousInput = "";
updateDisplay();
}
function clearDisplay() {
currentInput = "";
previousInput = "";
operation = null;
updateDisplay();
}
function deleteLast() {
currentInput = currentInput.slice(0, -1);
updateDisplay();
}
document.querySelectorAll(".number").forEach(function(button) {
button.addEventListener("click", function() {
handleNumber(button.innerText);
});
});
document.querySelectorAll(".operation").forEach(function(button) {
button.addEventListener("click", function() {
handleOperation(button.innerText);
});
});
document.getElementById("equals").addEventListener("click", calculate);
document.getElementById("clear").addEventListener("click", clearDisplay);
document.getElementById("delete").addEventListener("click", deleteLast);
});
</script>
</head>
<body>
<div id="main-container" class="container">
<h1>Simple Calculator</h1>
<input type="text" id="display" readonly />
<div>
<button class="btn number">7</button>
<button class="btn number">8</button>
<button class="btn number">9</button>
<button class="btn operation">/</button>
</div>
<div>
<button class="btn number">4</button>
<button class="btn number">5</button>
<button class="btn number">6</button>
<button class="btn operation">*</button>
</div>
<div>
<button class="btn number">1</button>
<button class="btn number">2</button>
<button class="btn number">3</button>
<button class="btn operation">-</button>
</div>
<div>
<button class="btn number">0</button>
<button class="btn number">.</button>
<button id="equals" class="btn operation">=</button>
<button class="btn operation">+</button>
</div>
<div>
<button id="clear" class="btn">C</button>
<button id="delete" class="btn">DEL</button>
</div>
</div>
</body>
</html>
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