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script.js
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function calculate(num1, num2, op) {
switch (op) {
case "+":
return parseFloat(num1) + parseFloat(num2);
case "-":
return parseFloat(num1) - parseFloat(num2);
case "*":
return parseFloat(num1) * parseFloat(num2);
case "/":
return parseFloat(num1) / parseFloat(num2);
case "%":
return parseFloat(num1) % parseFloat(num2);
}
}
let result = document.querySelector(".result");
let operation = document.querySelector(".operation");
document.querySelector("#clear").addEventListener("click", function () {
clear();
});
function clear() {
result.innerHTML = "";
sign.innerHTML = "";
prev.innerHTML = "";
}
const num_btns = document.querySelectorAll(".nmbr");
for (let i = 0; i < num_btns.length; i++) {
num_btns[i].addEventListener("click", () => {
let result = document.querySelector(".result");
result.innerHTML += num_btns[i].innerHTML;
});
}
const backspace = document.querySelector("#back");
backspace.addEventListener("click", () => {
result.innerHTML = result.innerHTML.slice(0, result.innerHTML.length - 1);
});
const operators = document.querySelectorAll(".ops");
const sign = document.querySelector("#sign");
const prev = document.querySelector("#prev");
for (let i = 0; i < operators.length; i++) {
operators[i].addEventListener("click", () => {
prev.innerHTML = result.innerHTML;
sign.innerHTML = operators[i].innerHTML;
result.innerHTML = "";
});
}
document.querySelector("#eval").addEventListener("click", () => {
let n1 = prev.innerHTML;
let n2 = result.innerHTML;
let op = sign.innerHTML;
if (n1 == "" || n2 == "" || op == "") {
result.innerHTML = "Please enter proper values";
setTimeout(() => {
clear();
}, 1000);
} else {
result.innerHTML = calculate(n1, n2, op);
}
if (isNaN(result.innerHTML)) {
setTimeout(() => {
clear();
}, 1000);
}
prev.innerHTML = "";
sign.innerHTML = "";
});