CodeAlpha_Calculator/script.js at main · SamayKothari/CodeAlpha_Calculator · GitHub

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const screen = document.getElementById("screen");
const buttons = document.querySelectorAll(".btn");

let currentInput = "";
let operatorPressed = false;

buttons.forEach(button => {

  button.addEventListener("click", () => {

    const value = button.getAttribute("data-value");

    if (value === "AC") {
      currentInput = "";
      screen.value = "0";
      return;
    }

    if (value === "DEL") {
      currentInput = currentInput.slice(0, -1);
      screen.value = currentInput || "0";
      return;
    }

    if (value === "=") {
      try {
        currentInput = eval(currentInput).toString();
        screen.value = currentInput;
      } catch {
        screen.value = "Error";
      }
      return;
    }

    if (value === "%") {
      currentInput = (eval(currentInput) / 100).toString();
      screen.value = currentInput;
      return;
    }

    currentInput += value;
    screen.value = currentInput;

  });

});

/* Keyboard Support */

document.addEventListener("keydown", (e) => {

  if (
    (e.key >= "0" && e.key <= "9") ||
    ["+", "-", "*", "/", "."].includes(e.key)
  ) {
    currentInput += e.key;
    screen.value = currentInput;
  }

  if (e.key === "Enter") {
    try {
      currentInput = eval(currentInput).toString();
      screen.value = currentInput;
    } catch {
      screen.value = "Error";
    }
  }

  if (e.key === "Backspace") {
    currentInput = currentInput.slice(0, -1);
    screen.value = currentInput || "0";
  }

  if (e.key === "Escape") {
    currentInput = "";
    screen.value = "0";
  }

});