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script.js
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script.js
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const result_display = document.querySelector("#result_display")
const operation_display = document.querySelector("#operation_display")
const controls_button = document.querySelectorAll(".controls_button")
const numbers = document.querySelectorAll(".number")
const operators = document.querySelectorAll(".op")
const clear_btn = document.querySelector("#clear")
const evaluate = document.querySelector("#evaluate")
let arr = [];
let n1 = 0;
let n2 = 0;
let operation = '';
let firstNum = true;
let evaluated = false;
let operated = false;
const sum = (a, b) => {
return +a + +b;
}
const subtr = (a, b) => {
return +a - +b;
}
const multiply = (a, b) => {
return a * b;
}
const divide = (a, b) => {
return a / b;
}
const operate = (a, b, id) => {
if(id == 'sum'){
return(sum(a, b));
} else if(id == 'subtr'){
return(subtr(a, b));
} else if(id == 'multiply'){
return(multiply(a, b));
} else if(id == 'divide'){
return(divide(a, b));
}
}
evaluate.addEventListener('click', () => {
if(n1 == 0 && n2 == 0){
window.alert('Please enter a number !')
}else if(evaluated){
window.alert('The operation has already been evaluated !')
}else{
renderResult();
n1 = operate(n1, n2, operation);
evaluated = true;
}
})
const renderResult = () => {
operation_display.innerHTML = operation_display.innerHTML + ' ' + result_display.innerHTML;
result_display.innerHTML = operate(n1, n2, operation);
}
numbers.forEach(function(number){
number.addEventListener('click', () => {
if(evaluated){
clearScreen();
}
arr.push(event.target.textContent);
if(firstNum == true){
n1 = arr.join('');
} else if(firstNum == false){
n2 = arr.join('');
}
result_display.innerHTML += event.target.innerHTML;
operated = false;
console.log('n1 = ' + n1);
console.log('n2 = ' + n2);
console.log('firstNum = ' + firstNum);
console.log(evaluated);
})
})
operators.forEach(function(op){
op.addEventListener("click", () => {
if(event.target.id != 'evaluate'){
if(operated == true){
window.alert('Please add a number after the operation <3')
}else{
if(firstNum){
if(result_display.innerHTML == ''){
result_display.innerHTML = '0';
}
result_display.innerHTML = result_display.innerHTML + ' ' + event.target.innerHTML + ' ';
firstNum = !firstNum;
} else {
if(evaluated){
console.log('ksjdhfkjsdhf')
console.log(evaluated)
operation_display.innerHTML = result_display.innerHTML + ' ' + event.target.innerHTML;
result_display.innerHTML = '';
} else{
result_display.innerHTML = '';
operation_display.innerHTML = operate(n1, n2, operation) + ' ' + event.target.innerHTML;
n1 = operate(n1, n2, operation);
}
}
}
arr = [];
operation = event.target.id;
operated = true;
if(evaluated){evaluated = false}
}
})
})
clear_btn.addEventListener('click', () => {
clearScreen();
})
const clearScreen = () => {
operation_display.innerHTML = '';
result_display.innerHTML = '';
n1 = 0;
n2 = 0;
firstNum = true;
evaluated = false;
arr = [];
}