Script chatgpt

				
					<script>
  var displayVal = "0";
  var pendingVal;
  var evalStringArray = [];

  var calcNumBtns = document.getElementsByClassName("calc-btn-num");
  var calcOperatorBtns = document.getElementsByClassName("calc-btn-operator");
  var calcDecimalBtn = document.getElementById("calc-btn-decimal");
  var calcClearBtn = document.getElementById("calc-btn-clear");
  var calcEqualBtn = document.getElementById("calc-btn-equal");
  var calcDisplayVal = document.getElementById("calc-display-val");

  for (var i = 0; i < calcNumBtns.length; i++) {
    calcNumBtns[i].addEventListener("click", updateDisplayVal, false);
  }

  for (var i = 0; i < calcOperatorBtns.length; i++) {
    calcOperatorBtns[i].addEventListener("click", performOperation, false);
  }

  calcDecimalBtn.addEventListener("click", addDecimal, false);
  calcClearBtn.addEventListener("click", clearAll, false);
  calcEqualBtn.addEventListener("click", performEvaluation, false);

  function updateDisplayVal(e) {
    var btnText = e.target.innerText;

    if (displayVal === "0") {
      displayVal = "";
    }

    displayVal += btnText;
    calcDisplayVal.innerText = displayVal;
  }

  function performOperation(e) {
    var operator = e.target.innerText;

    switch (operator) {
      case "+":
        pendingVal = displayVal;
        displayVal = "0";
        calcDisplayVal.innerText = displayVal;
        evalStringArray.push(pendingVal);
        evalStringArray.push("+");
        break;

      case "-":
        pendingVal = displayVal;
        displayVal = "0";
        calcDisplayVal.innerText = displayVal;
        evalStringArray.push(pendingVal);
        evalStringArray.push("-");
        break;

      case "x":
        pendingVal = displayVal;
        displayVal = "0";
        calcDisplayVal.innerText = displayVal;
        evalStringArray.push(pendingVal);
        evalStringArray.push("*");
        break;

      case "÷":
        pendingVal = displayVal;
        displayVal = "0";
        calcDisplayVal.innerText = displayVal;
        evalStringArray.push(pendingVal);
        evalStringArray.push("/");
        break;

      default:
        break;
    }
  }

  function addDecimal() {
    if (!displayVal.includes(".")) {
      displayVal += ".";
    }
    calcDisplayVal.innerText = displayVal;
  }

  function clearAll() {
    displayVal = "0