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script.js
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script.js
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let currentOperand = '';
let previousOperand = '';
let operation = null;
const displayElement = document.getElementById('display');
function clearDisplay() {
currentOperand = '';
previousOperand = '';
operation = null;
updateDisplay();
}
function appendNumber(number) {
if (number === '.' && currentOperand.includes('.')) return;
currentOperand = currentOperand.toString() + number.toString();
updateDisplay();
}
function chooseOperation(op) {
if (currentOperand === '') return;
if (previousOperand !== '') {
compute();
}
operation = op;
previousOperand = currentOperand;
currentOperand = '';
}
function compute() {
let computation;
const prev = parseFloat(previousOperand);
const current = parseFloat(currentOperand);
if (isNaN(prev) || isNaN(current)) return;
switch (operation) {
case '+':
computation = prev + current;
break;
case '-':
computation = prev - current;
break;
case '*':
computation = prev * current;
break;
case '/':
computation = prev / current;
break;
default:
return;
}
currentOperand = computation;
operation = null;
previousOperand = '';
updateDisplay();
}
function updateDisplay() {
displayElement.innerText = currentOperand;
}
clearDisplay();