var firstNumber = document.getElementById("firstNumber");
var secondNumber = document.getElementById("secondNumber");
var operator = document.getElementById("operator");
var calculateButton = document.getElementById("calculate");
var result = document.getElementById("result");
calculateButton.addEventListener("click", function() {
var firstNumberValue = firstNumber.value;
var secondNumberValue = secondNumber.value;
var operatorValue = operator.value;
var resultValue = eval(firstNumberValue + operatorValue + secondNumberValue);
result.innerHTML = resultValue;
});