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script.js
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script.js
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let firstOperand = ''
let secondOperand = ''
let operator = ''
let result = ''
let checkSize = true
const numbers = document.querySelectorAll('.numbers')
const operators = document.querySelectorAll('.operators')
const display = document.querySelector('.display')
const main = document.querySelector('.main')
const deleteButton = document.querySelector('#deleteButton')
const changePrefix = document.querySelector('#changePrefix')
const percentButton = document.querySelector('#percentButton')
const equalButton = document.querySelector('#equalButton')
const numArray = Array.from(numbers)
const oprArray = Array.from(operators)
window.addEventListener('load', () => {
if (String(display.innerHTML).length < 10) {
numArray.map(elem => elem.addEventListener('click', () => {
oprArray.map(element => {
if (element.innerHTML !== '=') {
element.style.background = '#ff9206'
element.style.color = 'white'
}
})
let str = String(display.innerHTML)
let check = true
if (checkSize !== true) display.style.fontSize = 68 + 'px'
checkSize = true
for (let i = 0; i < str.length; i++) {
if (str[i] === '.') {
check = !check
}
}
if (result !== '') {
display.innerHTML = '0'
result = ''
}
if (elem.innerHTML === '.' && display.innerHTML === '0') {
display.innerHTML += elem.innerHTML
firstOperand = display.innerHTML
} else if (elem.innerHTML === '.' && check === true || elem.innerHTML !== '.') {
if (operator === '') {
if (display.innerHTML === '0') display.innerHTML = ''
display.innerHTML += elem.innerHTML
firstOperand = display.innerHTML
} else {
secondOperand += elem.innerHTML
display.innerHTML = secondOperand
}
}
if (String(display.innerHTML).length > 6 && String(display.innerHTML).length < 10) {
display.style.fontSize = parseInt(getComputedStyle(display).fontSize) - 7 + 'px'
}
}))
}
oprArray.map(elem => elem.addEventListener('click', () => {
checkSize = false
oprArray.map(element => {
if (element.innerHTML !== '=') {
element.style.background = '#ff9206'
element.style.color = 'white'
}
})
if (elem.innerHTML !== '=') {
elem.style.background = 'white'
elem.style.color = '#ff9206'
operator = elem.innerHTML
}
secondOperand = ''
}))
})
deleteButton.addEventListener('click', () => {
oprArray.map(element => {
if (element.innerHTML !== '=') {
element.style.background = '#ff9206'
element.style.color = 'white'
}
})
display.style.fontSize = 68 + 'px'
checkSize = true
display.innerHTML = '0'
firstOperand = ''
secondOperand = ''
operator = ''
})
changePrefix.addEventListener('click', () => {
if (+display.innerHTML < 0) {
display.innerHTML = firstOperand = Math.abs(+firstOperand)
} else if (+display.innerHTML > 0) {
display.innerHTML = firstOperand = - +firstOperand
}
})
percentButton.addEventListener('click', () => {
firstOperand = display.innerHTML /= 100
})
equalButton.addEventListener('click', () => {
display.style.fontSize = 68 + 'px'
checkSize = true
if (firstOperand === '' && operator === '') {
result = 0
} else if (operator === '') {
result = firstOperand
} else if (secondOperand === '') {
secondOperand = firstOperand
}
if (operator === '+') {
result = +firstOperand + +secondOperand
} else if (operator === '-') {
result = +firstOperand - +secondOperand
} else if (operator === '×') {
result = +firstOperand * +secondOperand
} else if (operator === '/') {
result = +firstOperand / +secondOperand
}
operator = ''
firstOperand = display.innerHTML = result
if(String(result).length > 9) display.innerHTML = result.toString(16)
let x = String(display.innerHTML).length - 6
if (String(display.innerHTML).length > 6) {
display.style.fontSize = parseInt(getComputedStyle(display).fontSize) - 7*x + 'px'
} else if (display.innerHTML === 'NaN') {
display.style.fontSize = 60 + 'px'
display.innerHTML = 'Ошибка'
}
})