// Function to append the clicked button value to the display
function appendToDisplay(value) {
    document.getElementById('display').value += value;
}

// Function to clear the display
function clearDisplay() {
    document.getElementById('display').value = '';
}

// Function to calculate the result of the expression in the display
function calculateResult() {
    try {
        let result = eval(document.getElementById('display').value);
        document.getElementById('display').value = result;
    } catch (error) {
        document.getElementById('display').value = 'Error';
    }
}