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calculator.js
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calculator.js
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document.addEventListener("DOMContentLoaded", function() {
let inputBox = document.getElementById("inputBox");
let currentInput = '';
let operator = '';
let firstOperand = '';
let isOperatorClicked = false;
function updateInput() {
inputBox.value = currentInput;
}
function buttonClick(value) {
if (isOperatorClicked) {
currentInput = '';
isOperatorClicked = false;
}
currentInput += value;
updateInput();
}
function calculate() {
if (operator && firstOperand && currentInput) {
currentInput = operate(operator, parseFloat(firstOperand), parseFloat(currentInput));
operator = '';
firstOperand = '';
isOperatorClicked = true;
updateInput();
}
}
function clear() {
currentInput = '';
operator = '';
firstOperand = '';
updateInput();
}
document.querySelectorAll(".button").forEach(function(button) {
button.addEventListener("click", function() {
let value = this.textContent;
if (!isNaN(value) || value === '.') {
buttonClick(value);
} else if (value === '=' || value === 'Enter') {
calculate();
} else if (value === 'AC') {
clear();
} else if (value === 'DEL') {
currentInput = currentInput.slice(0, -1);
updateInput();
} else {
if (operator && firstOperand) {
calculate();
}
firstOperand = currentInput;
operator = value;
isOperatorClicked = true;
}
});
});
function operate(operator, num1, num2) {
switch (operator) {
case '+':
return num1 + num2;
case '-':
return num1 - num2;
case '*':
return num1 * num2;
case '/':
if (num2 === 0) {
return "Error";
}
return num1 / num2;
case '%':
return num1 % num2;
default:
return num2;
}
}
});