Addition
Subtraction
Multiplication
Division
Result: 0
function performCalculation() {
const num1 = parseFloat(document.getElementById(‘input-number’).value);
const num2 = parseFloat(document.getElementById(‘second-number’).value);
const operation = document.getElementById(‘operation’).value;
let result = 0;
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;
default:
alert(“Invalid operation.”);
return;
}
document.getElementById(‘calculation-result’).textContent = result;
}
