iOSCalculatorClone/script.js at main · Sandesh-008/iOSCalculatorClone · 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
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
const display = document.getElementById("display");
const expressionDisplay = document.getElementById("expression");

let currentInput = "";
let operator = "";
let previousInput = "";

function updateDisplay(value) {
  display.textContent = value;
}

function updateExpression() {
  expressionDisplay.textContent = `${previousInput} ${operator}`;
}

function appendNumber(num) {
  if (num === "." && currentInput.includes(".")) return;
  currentInput += num;
  updateDisplay(currentInput);
}

function appendOperator(op) {
  if (currentInput === "" && previousInput === "") return;
  if (currentInput === "") {
    operator = op;
    updateExpression();
    return;
  }
  if (previousInput !== "") {
    calculate();
  }
  operator = op;
  previousInput = currentInput;
  currentInput = "";
  updateExpression();
}

function formatResult(result) {
  return parseFloat(result.toFixed(2)).toString();
}

function calculate() {
  let result;
  const prev = parseFloat(previousInput);
  const curr = parseFloat(currentInput);
  if (isNaN(prev) || isNaN(curr)) return;

  switch (operator) {
    case "+":
      result = prev + curr;
      break;
    case "-":
      result = prev - curr;
      break;
    case "×":
      result = prev * curr;
      break;
    case "÷":
      result = curr === 0 ? "Error" : prev / curr;
      break;
    case "%":
      result = prev % curr;
      break;
    default:
      return;
  }

  if (result !== "Error") result = formatResult(result);
  updateDisplay(result);
  expressionDisplay.textContent = "";
  currentInput = result.toString();
  previousInput = "";
  operator = "";
}

function clearDisplay() {
  currentInput = "";
  previousInput = "";
  operator = "";
  updateDisplay("0");
  expressionDisplay.textContent = "";
}

function toggleSign() {
  if (currentInput !== "") {
    currentInput = (-parseFloat(currentInput)).toString();
    updateDisplay(currentInput);
  }
}