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index.js
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index.js
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const display = document.getElementById('display');
function addNumber(number) {
const currentNumber = display.value;
display.value = currentNumber + number;
}
function addOperator(operator) {
const currentNumber = display.value;
display.value = currentNumber + operator;
}
function clearDisplay() {
display.value = '';
}
function backspace() {
const currentExpression = display.value;
display.value = currentExpression.slice(0, -1);
}
function appendToDisplay(character) {
display.value += character;
}
function calculate() {
const currentExpression = display.value;
try {
const result = eval(currentExpression);
display.value = result;
} catch (error) {
display.value = 'Error';
}
}
// Add event listener for keyup
document.addEventListener('keyup', (event) => {
const key = event.key;
if (/^[0-9]$/.test(key)) {
addNumber(key);
} else if (key === '+' || key === '-' || key === '*' || key === '/' || key === '%') {
addOperator(key);
} else if (key === '.') {
addOperator('.');
} else if (key === 'Backspace') {
backspace();
} else if (key === 'Enter') {
calculate();
} else if (key === 'Escape') {
clearDisplay();
} else if (key == '=') {
calculate();
} else if (key === '(' || key === ')') {
appendToDisplay(key);
}
});