Calculator/script.js at main · Safwancs7/Calculator · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
const disp = document.getElementById("disp");
let cur = "", prev = "", op = "";

document.querySelectorAll("[data-num]").forEach(btn => {
  btn.onclick = () => {
    cur += btn.dataset.num;
    disp.textContent = cur;
  };
});

document.querySelectorAll("[data-op]").forEach(btn => {
  btn.onclick = () => {
    if (!cur) return;
    prev = cur;
    op = btn.dataset.op;
    cur = "";
  };
});

document.querySelector("[data-act='eq']").onclick = () => {
  if (!cur || !prev) return;
  const a = +prev, b = +cur;
  let res = 0;
  if (op === "+") res = a + b;
  if (op === "-") res = a - b;
  if (op === "*") res = a * b;
  if (op === "/") res = b === 0 ? "Err" : a / b;
  disp.textContent = res;
  cur = res.toString();
  prev = "";
  op = "";
};

document.querySelector("[data-act='clr']").onclick = () => {
  cur = prev = op = "";
  disp.textContent = "0";
};

document.querySelector("[data-act='del']").onclick = () => {
  cur = cur.slice(0, -1);
  disp.textContent = cur || "0";
};