function calculateResult(){ const num1 = parseFloat(document.getElementById(“number1”).value); const num2 = parseFloat(document.getElementById(“number2”).value); const operation = document.getElementById(“operation”).value; let result; if(isNaN(num1) || isNaN(num2)) { alert(“Please enter valid numbers.”); return; } switch(operation) { case “add”: result = num1 + num2; break; case “subtract”: result = num1 – num2; break; case “multiply”: result = num1 * num2; break; case “divide”: if(num2 === 0) { alert(“Cannot divide by zero.”); return; } result = num1 / num2; break; } document.getElementById(“result”).value = result; } function resetCalculator(){ document.querySelectorAll(“#calculator input, #calculator select”).forEach(el => el.value = “”); }