Casio FX 991 Online Calculator
Add
Subtract
Multiply
Divide
Result:
Awaiting Calculation…
document.getElementById(‘casio-fx-991-form’).addEventListener(‘submit’, function(event) {
event.preventDefault();
const num1 = parseFloat(document.getElementById(‘input1’).value);
const num2 = parseFloat(document.getElementById(‘input2’).value);
const operation = document.getElementById(‘operation’).value;
let result;
if (isNaN(num1) || isNaN(num2)) {
document.getElementById(‘result-text’).textContent = ‘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) {
result = ‘Cannot divide by zero’;
} else {
result = num1 / num2;
}
break;
default:
result = ‘Invalid operation’;
}
document.getElementById(‘result-text’).textContent = ‘Result: ‘ + result;
});
