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index5.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>Scientific Calculator</title>
<style>
:root {
--bg-color: #1e1e1e;
--screen-bg: #333333;
--text-color: #ffffff;
--secondary-text: #cccccc;
--btn-bg: #2d2d2d;
--btn-highlight: #3a3a3a;
--accent-color: #2f84f5;
--font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}
body {
background: var(--bg-color);
color: var(--text-color);
font-family: var(--font-family);
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
}
.calculator {
display: grid;
grid-template-rows: 100px auto;
border-radius: 12px;
overflow: hidden;
width: 380px;
background: var(--bg-color);
box-shadow: 0 8px 20px rgba(0,0,0,0.5);
}
.screen {
background: var(--screen-bg);
display: flex;
align-items: flex-end;
justify-content: flex-end;
padding: 20px;
font-size: 36px;
color: var(--text-color);
box-sizing: border-box;
overflow: hidden;
word-wrap: break-word;
user-select: none;
}
.buttons {
display: grid;
grid-template-columns: repeat(4, 1fr);
gap: 1px;
background: #000;
}
.btn {
background: var(--btn-bg);
border: none;
outline: none;
font-size: 18px;
color: var(--text-color);
padding: 20px;
cursor: pointer;
transition: background 0.2s ease;
}
.btn:hover {
background: var(--btn-highlight);
}
.btn:active {
background: var(--accent-color);
}
.btn.op {
color: var(--accent-color);
}
.btn.equals {
background: var(--accent-color);
color: #fff;
}
.btn.equals:hover {
background: #2c75d0;
}
.btn.special {
color: var(--secondary-text);
}
.btn:focus {
outline: 2px solid var(--accent-color);
}
/* Make the equals button span two columns if desired */
/* Example: Just to show customization. Currently not spanning two columns
If you want it to span, uncomment the line below and adjust layout accordingly.
*/
/* .equals { grid-column: span 2; } */
/* Responsive adjustments */
@media (max-width: 400px) {
.calculator {
width: 95%;
}
.screen {
font-size: 28px;
}
.btn {
font-size: 16px;
padding: 15px;
}
}
</style>
</head>
<body>
<div class="calculator">
<div class="screen" id="screen">0</div>
<div class="buttons">
<!-- Top row (clear, backspace, etc.) -->
<button class="btn special" data-action="clearEntry">CE</button>
<button class="btn special" data-action="clearAll">C</button>
<button class="btn special" data-action="backspace">⌫</button>
<button class="btn op" data-action="divide">÷</button>
<!-- Scientific row 1 -->
<button class="btn special" data-action="square">x²</button>
<button class="btn special" data-action="cube">x³</button>
<button class="btn special" data-action="power">x^y</button>
<button class="btn special" data-action="sqrt">√</button>
<!-- Scientific row 2 -->
<button class="btn special" data-action="cbrt">³√</button>
<button class="btn special" data-action="sin">sin</button>
<button class="btn special" data-action="cos">cos</button>
<button class="btn special" data-action="tan">tan</button>
<!-- Scientific row 3 -->
<button class="btn special" data-action="ln">ln</button>
<button class="btn special" data-action="log">log</button>
<button class="btn special" data-action="exp">e^x</button>
<button class="btn special" data-action="pi">π</button>
<!-- Number / Basic rows -->
<button class="btn" data-action="7">7</button>
<button class="btn" data-action="8">8</button>
<button class="btn" data-action="9">9</button>
<button class="btn op" data-action="multiply">×</button>
<button class="btn" data-action="4">4</button>
<button class="btn" data-action="5">5</button>
<button class="btn" data-action="6">6</button>
<button class="btn op" data-action="subtract">-</button>
<button class="btn" data-action="1">1</button>
<button class="btn" data-action="2">2</button>
<button class="btn" data-action="3">3</button>
<button class="btn op" data-action="add">+</button>
<button class="btn" data-action="sign">±</button>
<button class="btn" data-action="0">0</button>
<button class="btn" data-action="decimal">.</button>
<button class="btn equals" data-action="equals">=</button>
</div>
</div>
<script>
(function(){
const screen = document.getElementById('screen');
let currentValue = '0';
let storedValue = null;
let storedOperator = null;
let resetOnNextNumber = false;
const isOperator = (op) => ['add','subtract','multiply','divide','power'].includes(op);
function updateScreen(value) {
screen.textContent = value;
}
function inputDigit(digit) {
if (resetOnNextNumber) {
currentValue = digit;
resetOnNextNumber = false;
} else {
currentValue = currentValue === '0' ? digit : currentValue + digit;
}
updateScreen(currentValue);
}
function inputDecimal() {
if (resetOnNextNumber) {
currentValue = '0.';
resetOnNextNumber = false;
} else if (!currentValue.includes('.')) {
currentValue += '.';
}
updateScreen(currentValue);
}
function handleOperator(op) {
if (storedOperator && !resetOnNextNumber) {
evaluate();
}
storedValue = parseFloat(currentValue);
storedOperator = op;
resetOnNextNumber = true;
}
function evaluate() {
if (storedOperator === null || resetOnNextNumber) return;
let result = 0;
let secondValue = parseFloat(currentValue);
switch(storedOperator) {
case 'add':
result = storedValue + secondValue;
break;
case 'subtract':
result = storedValue - secondValue;
break;
case 'multiply':
result = storedValue * secondValue;
break;
case 'divide':
if (secondValue === 0) {
result = 'Error';
break;
}
result = storedValue / secondValue;
break;
case 'power':
result = Math.pow(storedValue, secondValue);
break;
default:
return;
}
currentValue = String(result);
updateScreen(currentValue);
storedOperator = null;
storedValue = null;
resetOnNextNumber = true;
}
function clearAll() {
currentValue = '0';
storedValue = null;
storedOperator = null;
resetOnNextNumber = false;
updateScreen(currentValue);
}
function clearEntry() {
currentValue = '0';
updateScreen(currentValue);
}
function backspace() {
if (!resetOnNextNumber) {
currentValue = currentValue.length > 1 ? currentValue.slice(0, -1) : '0';
updateScreen(currentValue);
}
}
function toggleSign() {
currentValue = String(parseFloat(currentValue) * -1);
updateScreen(currentValue);
}
// Scientific operations
function square() {
currentValue = String(Math.pow(parseFloat(currentValue), 2));
updateScreen(currentValue);
}
function cube() {
currentValue = String(Math.pow(parseFloat(currentValue), 3));
updateScreen(currentValue);
}
function sqrt() {
let val = parseFloat(currentValue);
currentValue = val < 0 ? 'Error' : String(Math.sqrt(val));
updateScreen(currentValue);
}
function cbrt() {
currentValue = String(Math.cbrt(parseFloat(currentValue)));
updateScreen(currentValue);
}
function sinVal() {
currentValue = String(Math.sin(parseFloat(currentValue) * Math.PI/180));
updateScreen(currentValue);
}
function cosVal() {
currentValue = String(Math.cos(parseFloat(currentValue) * Math.PI/180));
updateScreen(currentValue);
}
function tanVal() {
currentValue = String(Math.tan(parseFloat(currentValue) * Math.PI/180));
updateScreen(currentValue);
}
function lnVal() {
let val = parseFloat(currentValue);
currentValue = val <= 0 ? 'Error' : String(Math.log(val));
updateScreen(currentValue);
}
function logVal() {
let val = parseFloat(currentValue);
currentValue = val <= 0 ? 'Error' : String(Math.log10(val));
updateScreen(currentValue);
}
function expVal() {
currentValue = String(Math.exp(parseFloat(currentValue)));
updateScreen(currentValue);
}
function piVal() {
currentValue = String(Math.PI);
updateScreen(currentValue);
}
const actionMap = {
'0': ()=>inputDigit('0'),
'1': ()=>inputDigit('1'),
'2': ()=>inputDigit('2'),
'3': ()=>inputDigit('3'),
'4': ()=>inputDigit('4'),
'5': ()=>inputDigit('5'),
'6': ()=>inputDigit('6'),
'7': ()=>inputDigit('7'),
'8': ()=>inputDigit('8'),
'9': ()=>inputDigit('9'),
'decimal': inputDecimal,
'add': ()=>handleOperator('add'),
'subtract': ()=>handleOperator('subtract'),
'multiply': ()=>handleOperator('multiply'),
'divide': ()=>handleOperator('divide'),
'power': ()=>handleOperator('power'),
'equals': evaluate,
'clearAll': clearAll,
'clearEntry': clearEntry,
'backspace': backspace,
'sign': toggleSign,
'square': square,
'cube': cube,
'sqrt': sqrt,
'cbrt': cbrt,
'sin': sinVal,
'cos': cosVal,
'tan': tanVal,
'ln': lnVal,
'log': logVal,
'exp': expVal,
'pi': piVal,
};
document.querySelectorAll('.btn').forEach(btn => {
btn.addEventListener('click', () => {
const action = btn.getAttribute('data-action');
const fn = actionMap[action];
if (fn) fn();
});
});
})();
</script>
</body>
</html>