Calculadora/script.js at main · Bibi-1234/Calculadora · GitHub

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const result = document.querySelector(".resultado");
const buttons = document.querySelectorAll(".buttons button");

let currentNumber = "";
let firstOperand = null;
let operator = null;
let restart = false;

function updateResult(originClear = false){
    result.innerText = originClear ? 0 : currentNumber.replace(".",",");
}

function addDigit(digit){
    if (digit === "," && (currentNumber.includes(",") || !currentNumber)) return;

    if (restart){
        currentNumber = digit;
        restart = false;
    } else {
        currentNumber += digit;
    }

    updateResult();
}

function setOperator(newOperator) {
    if (currentNumber){
        calculate();

        firstOperand = parseFloat(currentNumber.replace(",","."));
        currentNumber="";
    }

    operator = newOperator;
}

function calculate(){
    if(operator === null || firstOperand === null) return;
    let secondOperand = parseFloat(currentNumber.replace(",","."));
    let resultValue;

    switch (operator) {
        case "+":
            resultValue = firstOperand + secondOperand;
            break;
        case "-":
            resultValue = firstOperand - secondOperand;
            break;
        case "x":
            resultValue = firstOperand * secondOperand;
            break;
        case "÷":
            resultValue = firstOperand / secondOperand;
            break;
        default:
            return;
    }

    if(resultValue.toString().split(".")[1]?.length > 5){
        currentNumber = parseFloat(resultValue.toFixed(5)).toString();
    } else {
        currentNumber = resultValue.toString();
    }

    operator = null;
    firstOperand = null;
    restart = true;
    percentageValue = null;
    updateResult();
}

function clearCalculator(){
    currentNumber = "";
    firstOperand = null;
    operator = null;
    updateResult(true);
}

function setPercenntage(){
    let result = parseFloat(currentNumber) / 100;

    if (["+", "-"].includes(operator)) {
      result = result * (firstOperand || 1);
    }

    if (result.toString().split(".")[1]?.length > 5) {
      result = result.toFixed(5).toString();
    }

    currentNumber = result.toString();
    updateResult();
  }

  buttons.forEach((button) => {
    button.addEventListener("click", () => {
      const buttonText = button.innerText;
      if (/^[0-9,]+$/.test(buttonText)) {
        addDigit(buttonText);
      } else if (["+", "-", "×", "÷"].includes(buttonText)) {
        setOperator(buttonText);
      } else if (buttonText === "=") {
        calculate();
      } else if (buttonText === "C") {
        clearCalculator();
      } else if (buttonText === "±") {
        currentNumber = (
          parseFloat(currentNumber || firstOperand) * -1
        ).toString();
        updateResult();
      } else if (buttonText === "%") {
        setPercentage();
      }
    });
  });