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logic.js
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logic.js
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let currentValue = "";
let previousValue = "";
let isDecimal = false;
let operator = "";
const currentScreen = document.querySelector('.current');
const previousScreen = document.querySelector('.previous');
const numbers = document.querySelectorAll('.number');
const operators = document.querySelectorAll('.operator');
const del = document.querySelector('.Del');
const clear = document.querySelector('.AC');
const equals = document.querySelector('.equals');
const decimal = document.querySelector('.decimal');
numbers.forEach((btn) => {
btn.addEventListener('click', (e) => {
previousScreen.classList.remove('bold');
if (previousValue === "Math Error") clearAll();
if (currentValue === 0) currentValue ="";
if (previousValue !== "" && currentValue !== "" && operator === "") {
previousValue = "";
currentScreen.textContent = currentValue;
}
if (Number(currentValue) <= 100000000){
currentValue += e.target.textContent;
currentScreen.textContent = currentValue;
operatorPressed = false;
}
})
});
operators.forEach((btn) => {
btn.addEventListener('click', (e) => {
previousScreen.classList.remove('bold');
if (previousValue === "") {
previousValue = currentValue;
operatorCheck(e.target.textContent);
}else if (currentValue === "") {
operatorCheck(e.target.textContent);
}else {
solve();
operator = e.target.textContent;
currentScreen.textContent = "";
previousScreen.textContent = `${previousValue} ${operator}`;
isDecimal = false;
}
})
});
equals.addEventListener('click', () => {
solve();
previousScreen.textContent = previousValue;
currentScreen.textContent = "";
currentValue = "";
previousScreen.classList.add('bold');
});
function solve() {
previousValue = Number(previousValue);
currentValue = Number(currentValue);
if (operator === "+") previousValue += currentValue;
if (operator === "-") previousValue -= currentValue;
if (operator === "x") previousValue *= currentValue;
if (operator === "÷") previousValue /= currentValue;
if (operator === "!") {
if (previousValue <= 0) previousValue = 1;
for (let i = previousValue-1; i >= 1 ;i--){
previousValue *= i;
}
if (previousValue >= 1000000000) previousValue = "Math Error";
return previousValue;
}
previousValue = Math.round(previousValue*1000000000) / 1000000000;
if (previousValue >= 1000000000) previousValue = "Math Error";
currentValue = "";
currentScreen.textContent = "";
}
function operatorCheck(op) {
operator = op;
currentScreen.textContent = "";
previousScreen.textContent = `${previousValue} ${operator}`;
currentValue = "";
isDecimal = false;
}
del.addEventListener('click', () => {
if (currentValue.length === 1) currentValue = 0;
else currentValue = currentValue.slice(0,currentValue.length-1);
currentScreen.textContent = currentValue;
isDecimal = false;
})
decimal.addEventListener ('click', (e) => {
if(!isDecimal) {
previousScreen.classList.remove('bold');
if(currentValue === "") currentValue = "";
currentValue += e.target.textContent;
currentScreen.textContent = currentValue;
isDecimal = true;
}
})
clear.addEventListener('click', clearAll);
function clearAll() {
previousValue = "";
currentValue = "";
isDecimal = false;
currentScreen.textContent = "";
previousScreen.innerHTML = ' ';
operator = "";
}
document.addEventListener('keydown', (e) => {
let getOperators = ['/', '*', '^','!', '+', '-'];
if (!isNaN(e.key) && e.key !== ' ') document.getElementById(e.key).click();
if (getOperators.includes(e.key)) document.getElementById(e.key).click();
if (e.key === '=' || e.key === 'Enter') equals.click();
if (e.key === 'Delete') del.click();
if (e.key === 'Backspace' || e.key === 'c' || e.key === 'C') clear.click();
if (e.key === '.') decimal.click();
})