Casio FX-991ES Plus Second Edition Calculator
Calculate your basic mathematical operations using the Casio FX-991ES Plus Second Edition calculator model.
Addition (+)
Subtraction (-)
Multiplication (×)
Division (÷)
function calculate() {
const num1 = parseFloat(document.getElementById(“input1”).value);
const num2 = parseFloat(document.getElementById(“input2”).value);
const operation = document.getElementById(“operation”).value;
if (isNaN(num1) || isNaN(num2)) {
alert(“Please enter valid numbers.”);
return;
}
let result;
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(“result”).value = result.toFixed(2);
}
function resetCalculator() {
document.getElementById(“input1”).value = “”;
document.getElementById(“input2”).value = “”;
document.getElementById(“operation”).value = “add”;
document.getElementById(“result”).value = “”;
}
